{"title":"Engine — LS 4INCH Stroke","description":null,"products":[{"product_id":"crow-cams-19244049","title":"Crow Cams \/ Genuine GM LS 4\" Stroke Windage Tray","description":"\u003cp\u003eLS 4\" Stroke Windage Tray is a Manufacturer-listed engine or valvetrain component supplied through Crow Cams. It must be selected by exact part number and engine configuration rather than by vehicle name alone.\u003c\/p\u003e\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e19244049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent brand\u003c\/th\u003e\n\u003ctd\u003eGenuine GM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct category\u003c\/th\u003e\n\u003ctd\u003eEngine Parts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eTechnical Information\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eConfirm exact supplied contents with Built by Boost \u0026amp; Tune before ordering.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eApplication \u0026amp; Fitment\u003c\/h3\u003e\u003cp\u003eCompatible GM LS \/ engine-family applications shown for this product. Confirm the exact engine code and build before ordering. Manufacturer Part Number: 19244049\u003c\/p\u003e\u003ch3\u003eSupplied Contents\u003c\/h3\u003e\u003cp\u003eThe part or quantity described by this SKU is supplied. Related components, installation hardware and ancillary parts are separate unless explicitly stated.\u003c\/p\u003e\u003ch3\u003eInstallation \u0026amp; Configuration\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eConfirm exact engine and part-number compatibility, supplied components and all required service hardware before installation. Follow the product-manufacturer and engine-manufacturer procedures.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eAssociated Products \u0026amp; Selection\u003c\/h3\u003e\u003cp\u003eBuilt by Boost \u0026amp; Tune can confirm the exact engine-specific supporting components and provide a complete parts recommendation before ordering.\u003c\/p\u003e\u003ch3\u003eProduct Selection \u0026amp; Workshop Support\u003c\/h3\u003e\u003cp\u003eBuilt by Boost \u0026amp; Tune is an authorised Crow Cams dealer and performance engine workshop. We can assist with the correct camshaft profile, compatible valve-train hardware, engine preparation, installation and calibration. Provide the exact engine code, intended use and existing components so the complete package can be checked before ordering.\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eChevrolet Engine Family Ls 4Inch Stroke Build\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eWorkshop Support\u003c\/h2\u003e\u003cp\u003eBuilt by Boost \u0026amp; Tune can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.\u003c\/p\u003e\u003ch2\u003eInstallation Guidance\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eProfessional installation recommended:\u003c\/strong\u003e Professional installation is recommended for this listing.\u003c\/li\u003e\u003c\/ul\u003e\n\u003csection class=\"related-product-ranges\"\u003e\u003ch3\u003eExplore related ranges\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"\/collections\/bbt-brand-crow-cams\"\u003eCrow Cams\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003c\/section\u003e","brand":"Crow Cams","offers":[{"title":"Default Title","offer_id":43772469870659,"sku":"19244049","price":194.23,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/800x800-thumbnail-1683855958.19244049.jpg?v=1788856929"},{"product_id":"diamond-special-order-gm-ls3-l92-4-000-in-stroke-6-125-in-rod-1-115-in-ch","title":"Diamond Forged Piston Kit — GM LS3 \/ L92 — 4.000 in stroke","description":"\u003cdiv class=\"bbt-diamond-advert\" style=\"line-height:1.65;\"\u003e\n\u003cdiv style=\"border-left:4px solid #0f536b;padding:4px 0 4px 18px;margin-bottom:22px;\"\u003e\n\u003cp style=\"font-size:0.8em;letter-spacing:0.12em;color:#52616d;margin:0 0 8px;\"\u003eDIAMOND PISTONS · SPECIAL ORDER\u003c\/p\u003e\n\u003ch2 style=\"margin:0 0 12px;\"\u003eGM LS3 \/ L92 forged piston kit\u003c\/h2\u003e\n\u003cp\u003eBuild your GM LS3 \/ L92 rotating assembly around a Diamond \u003cstrong\u003e8-piston forged kit\u003c\/strong\u003e. Specify the finished bore, crown volume and gudgeon pins to suit your measured engine, fuel and intended use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStroker configuration:\u003c\/strong\u003e this kit requires the stated crankshaft stroke and connecting-rod geometry.\u003c\/p\u003e\n\u003cp style=\"margin:16px 0 0;color:#304652;\"\u003e\u003cstrong\u003eMade to order.\u003c\/strong\u003e Allow approximately \u003cstrong\u003e5–6 weeks for delivery\u003c\/strong\u003e, pending Australian customs processing time. Manufacturing schedules, international freight and customs clearance may extend this estimate.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003ch3\u003ePrecision in the details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2618 aluminium, forged and machined in the USA.\u003c\/li\u003e\n\u003cli\u003e3D-machined crowns with valve reliefs designed for aftermarket cylinder-head combinations; verify clearance with your actual heads and camshaft.\u003c\/li\u003e\n\u003cli\u003eOffset pins and moly-coated skirts.\u003c\/li\u003e\n\u003cli\u003eThe selected kit includes its specified ring package, pins and retainers, with oil-rail supports where shown in the kit table.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat your kit includes\u003c\/h3\u003e\n\u003cp\u003e8 forged pistons, the specified ring set, gudgeon pins and retainers. Oil-rail supports are supplied where indicated in the exact kit table.\u003c\/p\u003e\n\u003cp\u003eChoose the standard gudgeon-pin kit or the \u003cstrong\u003eH13 upgrade\u003c\/strong\u003e in the selector. Part numbers ending in \u003cstrong\u003e-H\u003c\/strong\u003e identify the upgraded pin kit; the displayed price covers the complete piston kit with that pin specification.\u003c\/p\u003e\n\u003ch3\u003eBuild dimensions\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;margin:14px 0;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.9em;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003ePiston Quantity\u003c\/th\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eCompression Height\u003c\/th\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.115 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eStroke\u003c\/th\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.000 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRod Length\u003c\/th\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e6.125 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRing Set Thickness\u003c\/th\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eForging Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eFull Round\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003cdetails class=\"bbt-diamond-engineering\" style=\"margin:20px 0;\"\u003e\u003csummary style=\"font-weight:700;color:#0f536b;cursor:pointer;\"\u003eEngineering reference: rings, pins and valve pockets\u003c\/summary\u003e\u003cp\u003eRing sizes are listed as top \/ second \/ oil ring. Check pin diameter and length against your connecting-rod small end. Valve-pocket depths are catalogue dimensions; your engine builder must check piston-to-valve clearance with the actual cylinder heads, camshafts and cam timing.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable cellpadding=\"8\" style=\"width:100%;border-collapse:collapse;font-size:0.92em;\"\u003e\n\u003cthead style=\"background:#f3f5f7;text-align:left;\"\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eKit SKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eRing package\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePin diameter\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePin length\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eValve-pocket depth: intake \/ exhaust\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e11553-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11553-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11544-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11544-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11523-R2-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11523-R2-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11546-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11546-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11524-R2-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11524-R2-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11525-R2-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11525-R2-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:0.9em;color:#52616d;\"\u003eA dimension marked “Not published” needs confirmation with BBT before ordering. Catalogue dimensions do not specify running clearance or ring end gap; use the instructions supplied with your exact kit.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch3\u003eFitment and engine preparation\u003c\/h3\u003e\n\u003cp\u003eFor LS3\/L92 builds with the selected bore and listed crank\/rod dimensions. The 4.000 in stroke group requires a matching stroker crank. Confirm cylinder-head valve layout, sleeves, deck height and pin-retainer system before ordering. Oversize bores require block assessment and machining.\u003c\/p\u003e\n\u003cp\u003eCatalogue bores are finished cylinder-bore sizes. The finished compression ratio depends on chamber volume, deck clearance and compressed head-gasket thickness. Have your engine builder verify piston-to-wall clearance, ring gaps, pin fit and piston-to-valve clearance using the supplied Diamond instructions before machining or assembly.\u003c\/p\u003e\n\u003cdetails style=\"border:1px solid #d9dee3;border-radius:4px;padding:14px 16px;margin:22px 0;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:700;\"\u003eView kit part numbers, bore sizes and supplied components\u003c\/summary\u003e\u003cdiv style=\"overflow-x:auto;margin:14px 0;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.9em;\"\u003e\n\u003cthead style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003e\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eKit SKU\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eBore\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eCrown volume\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRatio\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eIncluded pin\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRing set\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRetainer\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eOil-rail supports\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11553-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.065 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-21.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e9.40:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454065\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11553-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.065 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-21.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e9.40:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454065\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11544-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.065 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.40:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454065\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11544-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.065 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.40:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454065\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11523-R2-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.070 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-10.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e10.50:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454070\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11523-R2-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.070 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-10.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e10.50:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454070\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11546-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.070 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.40:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454070\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11546-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.070 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.40:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454070\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11524-R2-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.080 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-21.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e10.50:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454080\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11524-R2-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.080 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-21.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e10.50:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454080\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11525-R2-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.080 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.50:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454080\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11525-R2-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.080 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.50:1 nominal\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454080\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:0.9em;\"\u003eSelect the finished bore first, then a matching crown and nominal compression ratio, followed by an available gudgeon-pin specification. Pin choices depend on the selected bore and crown. Compression ratios are nominal catalogue figures; the final ratio depends on the measured chamber, deck and gasket volumes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv style=\"background:#f3f5f7;border-left:4px solid #0f536b;padding:14px 18px;margin:22px 0;\"\u003e\n\u003ch3 style=\"margin:0 0 8px;\"\u003eMade to order · delivery\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAllow approximately 5–6 weeks for delivery, pending Australian customs processing time.\u003c\/strong\u003e Manufacturing schedules, international freight and customs clearance may extend this estimate. Contact BBT before ordering for a build with a fixed deadline.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePlan your build with BBT\u003c\/h3\u003e\n\u003cp\u003eBuilt by Boost \u0026amp; Tune can help select a specification for your fuel, boost and intended use. Machining, engine assembly, connecting rods and tuning are purchased separately.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/bt-fit-engine-ls\"\u003eBrowse related GM LS3 \/ L92 engine parts\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp style=\"font-size:0.85em;color:#596773;\"\u003ePhotography shows a representative Diamond piston design. Crown shape, valve pockets, skirt finish and supplied components vary with the selected part number.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Diamond Pistons","offers":[{"title":"4.065 in \/ -21.00 cc \/ 9.40:1 nominal \/ Standard G-series","offer_id":67606780936259,"sku":"11553-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.065 in \/ -21.00 cc \/ 9.40:1 nominal \/ H13 upgrade","offer_id":67606780969027,"sku":"11553-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.065 in \/ -2.00 cc \/ 11.40:1 nominal \/ Standard G-series","offer_id":67606781001795,"sku":"11544-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.065 in \/ -2.00 cc \/ 11.40:1 nominal \/ H13 upgrade","offer_id":67606781034563,"sku":"11544-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.070 in \/ -10.00 cc \/ 10.50:1 nominal \/ Standard G-series","offer_id":67606781067331,"sku":"11523-R2-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.070 in \/ -10.00 cc \/ 10.50:1 nominal \/ H13 upgrade","offer_id":67606781100099,"sku":"11523-R2-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.070 in \/ -2.00 cc \/ 11.40:1 nominal \/ Standard G-series","offer_id":67606781132867,"sku":"11546-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.070 in \/ -2.00 cc \/ 11.40:1 nominal \/ H13 upgrade","offer_id":67606781165635,"sku":"11546-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.080 in \/ -21.00 cc \/ 10.50:1 nominal \/ Standard G-series","offer_id":67606781198403,"sku":"11524-R2-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.080 in \/ -21.00 cc \/ 10.50:1 nominal \/ H13 upgrade","offer_id":67606781231171,"sku":"11524-R2-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.080 in \/ -2.00 cc \/ 11.50:1 nominal \/ Standard G-series","offer_id":67606781263939,"sku":"11525-R2-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.080 in \/ -2.00 cc \/ 11.50:1 nominal \/ H13 upgrade","offer_id":67606781296707,"sku":"11525-R2-8-H","price":2653.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/F26084_8922.jpg?v=1791003703"},{"product_id":"diamond-special-order-gm-ls1-based-custom-bore-4-000-stroke-6-125-rod-1-115-ch","title":"Diamond Forged Pistons - GM LS1-based custom-bore - 4.000 in Stroke, 6.125 in Rod","description":"\u003cdiv class=\"bbt-diamond-advert\" style=\"line-height:1.65;\"\u003e\n\u003cdiv style=\"border-left:4px solid #0f536b;padding:4px 0 4px 18px;margin-bottom:22px;\"\u003e\n\u003cp style=\"font-size:0.8em;letter-spacing:0.12em;color:#52616d;margin:0 0 8px;\"\u003eDIAMOND PISTONS · SPECIAL ORDER\u003c\/p\u003e\n\u003ch2 style=\"margin:0 0 12px;\"\u003eGM LS1-based custom-bore forged piston kit\u003c\/h2\u003e\n\u003cp\u003eBuild your GM LS1-based custom-bore rotating assembly around a Diamond \u003cstrong\u003e8-piston forged kit\u003c\/strong\u003e. Specify the finished bore, crown volume and gudgeon pins to suit your measured engine, fuel and intended use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCustom-bore engine build:\u003c\/strong\u003e suitable sleeves or an aftermarket block are required. Confirm the finished bore with your engine builder before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStroker configuration:\u003c\/strong\u003e this kit requires the stated crankshaft stroke and connecting-rod geometry.\u003c\/p\u003e\n\u003cp style=\"margin:16px 0 0;color:#304652;\"\u003e\u003cstrong\u003eMade to order.\u003c\/strong\u003e Allow approximately \u003cstrong\u003e5–6 weeks for delivery\u003c\/strong\u003e, pending Australian customs processing time. Manufacturing schedules, international freight and customs clearance may extend this estimate.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003ch3\u003ePrecision in the details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eForged 2618 aluminium construction, machined in the USA.\u003c\/li\u003e\n\u003cli\u003eMachined crown and valve-relief profiles; verify the chosen cylinder head and camshaft combination.\u003c\/li\u003e\n\u003cli\u003eOffset pins and moly-coated skirts.\u003c\/li\u003e\n\u003cli\u003eTrend gudgeon pins, the listed ring set and pin retainers included.\u003c\/li\u003e\n\u003cli\u003eCatalogue compression figures use a 0.040-inch head gasket; actual ratio depends on the measured engine assembly.\u003c\/li\u003e\n\u003cli\u003eTop compression ring positioned 0.250 in below the crown.\u003c\/li\u003e\n\u003cli\u003eCatalogue valve-pocket depths: 0.176 in intake \/ 0.105 in exhaust. Verify piston-to-valve clearance with the actual cylinder heads, camshaft and valve timing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat your kit includes\u003c\/h3\u003e\n\u003cp\u003e8 forged pistons, the specified ring set, gudgeon pins and retainers. Oil-rail supports are supplied where indicated in the exact kit table.\u003c\/p\u003e\n\u003cp\u003eChoose the standard gudgeon-pin kit or the \u003cstrong\u003eH13 upgrade\u003c\/strong\u003e in the selector. Part numbers ending in \u003cstrong\u003e-H\u003c\/strong\u003e identify the upgraded pin kit; the displayed price covers the complete piston kit with that pin specification.\u003c\/p\u003e\n\u003ch3\u003eBuild dimensions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCrankshaft stroke: 4.000 inch\u003c\/li\u003e\n\u003cli\u003eConnecting-rod length: 6.125 inch\u003c\/li\u003e\n\u003cli\u003eCompression height: 1.115 inch\u003c\/li\u003e\n\u003cli\u003eGudgeon-pin diameter: 0.927 inch\u003c\/li\u003e\n\u003cli\u003eQuantity: eight pistons; rings, pins and retainers included. Oil-rail supports are included where indicated in the kit table.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdetails class=\"bbt-diamond-engineering\" style=\"margin:20px 0;\"\u003e\u003csummary style=\"font-weight:700;color:#0f536b;cursor:pointer;\"\u003eEngineering reference: rings, pins and valve pockets\u003c\/summary\u003e\u003cp\u003eRing sizes are listed as top \/ second \/ oil ring. Check pin diameter and length against your connecting-rod small end. Valve-pocket depths are catalogue dimensions; your engine builder must check piston-to-valve clearance with the actual cylinder heads, camshafts and cam timing.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable cellpadding=\"8\" style=\"width:100%;border-collapse:collapse;font-size:0.92em;\"\u003e\n\u003cthead style=\"background:#f3f5f7;text-align:left;\"\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eKit SKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eRing package\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePin diameter\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePin length\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eValve-pocket depth: intake \/ exhaust\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e11518-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11520-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11521-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11522-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11518-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11520-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11521-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11522-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.20 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:0.9em;color:#52616d;\"\u003eA dimension marked “Not published” needs confirmation with BBT before ordering. Catalogue dimensions do not specify running clearance or ring end gap; use the instructions supplied with your exact kit.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch3\u003eFitment and engine preparation\u003c\/h3\u003e\n\u003cp\u003eFor LS1-based engine builds with suitable sleeves or an aftermarket block. The listed 4.000-inch and larger bores must not be treated as a routine overbore of a production 5.7-litre LS1 block. Confirm the block and cylinder-head combination before ordering.\u003c\/p\u003e\n\u003cp\u003eRequires a 4.000-inch stroker crankshaft and the listed 6.125-inch rods. This is not a standard-stroke replacement piston.\u003c\/p\u003e\n\u003cp\u003eThe gudgeon-pin diameter for this group is 0.927 inch. Rod small-end diameter, rod length and pin retention must match the selected kit. The standard and H13 options are priced as complete eight-piston kits.\u003c\/p\u003e\n\u003cp\u003eHave your engine builder check piston-to-bore clearance, ring gaps, deck height, piston-to-valve clearance and rotating-assembly balance before assembly. Nominal compression ratios are selection guides, not a substitute for measuring the chamber, gasket and deck volumes.\u003c\/p\u003e\n\u003cdetails style=\"border:1px solid #d9dee3;border-radius:4px;padding:14px 16px;margin:22px 0;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:700;\"\u003eView kit part numbers, bore sizes and supplied components\u003c\/summary\u003e\u003cdiv style=\"overflow-x:auto;margin:14px 0;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.9em;\"\u003e\n\u003cthead style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003e\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eKit SKU\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eBore\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eCrown volume\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eNominal ratio\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eIncluded pin\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRing set\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRing thickness\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRetainer\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eOil-rail supports\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11518-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.000 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.10:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454005\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11520-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.000 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-15.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e9.70:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454005\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11521-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.030 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-15.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e9.80:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454030\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11522-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.125 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-7.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.10:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454065\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11518-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.000 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-2.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.10:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454005\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11520-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.000 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-15.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e9.70:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454005\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11521-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.030 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-15.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e9.80:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454030\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11522-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e4.125 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-7.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11.10:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09454065\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.20 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:0.9em;\"\u003eSelect the finished bore first, then a matching crown and nominal compression ratio, followed by an available gudgeon-pin specification. Pin choices depend on the selected bore and crown. Compression ratios are nominal catalogue figures; the final ratio depends on the measured chamber, deck and gasket volumes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv style=\"background:#f3f5f7;border-left:4px solid #0f536b;padding:14px 18px;margin:22px 0;\"\u003e\n\u003ch3 style=\"margin:0 0 8px;\"\u003eMade to order · delivery\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAllow approximately 5–6 weeks for delivery, pending Australian customs processing time.\u003c\/strong\u003e Manufacturing schedules, international freight and customs clearance may extend this estimate. Contact BBT before ordering for a build with a fixed deadline.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePlan your build with BBT\u003c\/h3\u003e\n\u003cp\u003eBoost \u0026amp; Tune can help coordinate the piston, rod and crank dimensions with your planned naturally aspirated or boosted LS build. Contact BBT with your engine code, measured bore, cylinder heads and target use before ordering if the combination is not already specified.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/bt-fit-engine-ls1\"\u003eLS1 engine parts\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"font-size:0.85em;color:#596773;\"\u003ePhotography shows a representative Diamond piston design. Crown shape, valve pockets, skirt finish and supplied components vary with the selected part number.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Diamond Pistons","offers":[{"title":"4.000 in \/ -2.00 cc \/ 11.10:1 nominal \/ Standard G-series","offer_id":67607064313923,"sku":"11518-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.000 in \/ -15.00 cc \/ 9.70:1 nominal \/ Standard G-series","offer_id":67607064346691,"sku":"11520-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.030 in \/ -15.00 cc \/ 9.80:1 nominal \/ Standard G-series","offer_id":67607064379459,"sku":"11521-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.125 in \/ -7.00 cc \/ 11.10:1 nominal \/ Standard G-series","offer_id":67607064412227,"sku":"11522-R1-8","price":2460.0,"currency_code":"AUD","in_stock":true},{"title":"4.000 in \/ -2.00 cc \/ 11.10:1 nominal \/ H13 upgrade","offer_id":67607064444995,"sku":"11518-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.000 in \/ -15.00 cc \/ 9.70:1 nominal \/ H13 upgrade","offer_id":67607064477763,"sku":"11520-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.030 in \/ -15.00 cc \/ 9.80:1 nominal \/ H13 upgrade","offer_id":67607064510531,"sku":"11521-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true},{"title":"4.125 in \/ -7.00 cc \/ 11.10:1 nominal \/ H13 upgrade","offer_id":67607064543299,"sku":"11522-R1-8-H","price":2653.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/F26084_5218.jpg?v=1791010502"},{"product_id":"diamond-special-order-holden-gm-ls1-4-000-stroke-6-125-rod-1-115-ch","title":"Diamond Forged Pistons - Holden \/ GM LS1 - 4.000 in Stroke, 6.125 in Rod","description":"\u003cdiv class=\"bbt-diamond-advert\" style=\"line-height:1.65;\"\u003e\n\u003cdiv style=\"border-left:4px solid #0f536b;padding:4px 0 4px 18px;margin-bottom:22px;\"\u003e\n\u003cp style=\"font-size:0.8em;letter-spacing:0.12em;color:#52616d;margin:0 0 8px;\"\u003eDIAMOND PISTONS · SPECIAL ORDER\u003c\/p\u003e\n\u003ch2 style=\"margin:0 0 12px;\"\u003eHolden \/ GM LS1 forged piston kit\u003c\/h2\u003e\n\u003cp\u003eBuild your Holden \/ GM LS1 rotating assembly around a Diamond \u003cstrong\u003e8-piston forged kit\u003c\/strong\u003e. Specify the finished bore, crown volume and gudgeon pins to suit your measured engine, fuel and intended use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStroker configuration:\u003c\/strong\u003e this kit requires the stated crankshaft stroke and connecting-rod geometry.\u003c\/p\u003e\n\u003cp style=\"margin:16px 0 0;color:#304652;\"\u003e\u003cstrong\u003eMade to order.\u003c\/strong\u003e Allow approximately \u003cstrong\u003e5–6 weeks for delivery\u003c\/strong\u003e, pending Australian customs processing time. Manufacturing schedules, international freight and customs clearance may extend this estimate.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003ch3\u003ePrecision in the details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eForged 2618 aluminium construction, machined in the USA.\u003c\/li\u003e\n\u003cli\u003eMachined crown and valve-relief profiles; verify the chosen cylinder head and camshaft combination.\u003c\/li\u003e\n\u003cli\u003eOffset pins and moly-coated skirts.\u003c\/li\u003e\n\u003cli\u003eTrend gudgeon pins, the listed ring set and pin retainers included.\u003c\/li\u003e\n\u003cli\u003eCatalogue compression figures use a 0.040-inch head gasket; actual ratio depends on the measured engine assembly.\u003c\/li\u003e\n\u003cli\u003eTop compression ring positioned 0.250 in below the crown.\u003c\/li\u003e\n\u003cli\u003eCatalogue valve-pocket depths: 0.176 in intake \/ 0.105 in exhaust. Verify piston-to-valve clearance with the actual cylinder heads, camshaft and valve timing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat your kit includes\u003c\/h3\u003e\n\u003cp\u003e8 forged pistons, the specified ring set, gudgeon pins and retainers. Oil-rail supports are supplied where indicated in the exact kit table.\u003c\/p\u003e\n\u003cp\u003eChoose the standard gudgeon-pin kit or the \u003cstrong\u003eH13 upgrade\u003c\/strong\u003e in the selector. Part numbers ending in \u003cstrong\u003e-H\u003c\/strong\u003e identify the upgraded pin kit; the displayed price covers the complete piston kit with that pin specification.\u003c\/p\u003e\n\u003ch3\u003eBuild dimensions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCrankshaft stroke: 4.000 inch\u003c\/li\u003e\n\u003cli\u003eConnecting-rod length: 6.125 inch\u003c\/li\u003e\n\u003cli\u003eCompression height: 1.115 inch\u003c\/li\u003e\n\u003cli\u003eGudgeon-pin diameter: 0.927 inch\u003c\/li\u003e\n\u003cli\u003eQuantity: eight pistons; rings, pins and retainers included. Oil-rail supports are included where indicated in the kit table.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdetails class=\"bbt-diamond-engineering\" style=\"margin:20px 0;\"\u003e\u003csummary style=\"font-weight:700;color:#0f536b;cursor:pointer;\"\u003eEngineering reference: rings, pins and valve pockets\u003c\/summary\u003e\u003cp\u003eRing sizes are listed as top \/ second \/ oil ring. Check pin diameter and length against your connecting-rod small end. Valve-pocket depths are catalogue dimensions; your engine builder must check piston-to-valve clearance with the actual cylinder heads, camshafts and cam timing.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable cellpadding=\"8\" style=\"width:100%;border-collapse:collapse;font-size:0.92em;\"\u003e\n\u003cthead style=\"background:#f3f5f7;text-align:left;\"\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eKit SKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eRing package\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePin diameter\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePin length\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eValve-pocket depth: intake \/ exhaust\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e11504-R1-8\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.50 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11504-R1-8-H\u003c\/td\u003e\n\u003ctd\u003e1.20 mm \/ 1.50 mm \/ 3.00 mm\u003c\/td\u003e\n\u003ctd\u003e0.927 in\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003e0.176 in \/ 0.105 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:0.9em;color:#52616d;\"\u003eA dimension marked “Not published” needs confirmation with BBT before ordering. Catalogue dimensions do not specify running clearance or ring end gap; use the instructions supplied with your exact kit.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch3\u003eFitment and engine preparation\u003c\/h3\u003e\n\u003cp\u003eRequires a 4.000-inch stroker crankshaft and the listed 6.125-inch rods. This is not a standard-stroke replacement piston.\u003c\/p\u003e\n\u003cp\u003eThe gudgeon-pin diameter for this group is 0.927 inch. Rod small-end diameter, rod length and pin retention must match the selected kit. The standard and H13 options are priced as complete eight-piston kits.\u003c\/p\u003e\n\u003cp\u003eHave your engine builder check piston-to-bore clearance, ring gaps, deck height, piston-to-valve clearance and rotating-assembly balance before assembly. Nominal compression ratios are selection guides, not a substitute for measuring the chamber, gasket and deck volumes.\u003c\/p\u003e\n\u003cdetails style=\"border:1px solid #d9dee3;border-radius:4px;padding:14px 16px;margin:22px 0;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:700;\"\u003eView kit part numbers, bore sizes and supplied components\u003c\/summary\u003e\u003cdiv style=\"overflow-x:auto;margin:14px 0;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.9em;\"\u003e\n\u003cthead style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003e\u003ctr\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eKit SKU\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eBore\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eCrown volume\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eNominal ratio\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eIncluded pin\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRing set\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRing thickness\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eRetainer\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #d9dee3;background:#f3f5f7;\"\u003eOil-rail supports\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11504-R1-8\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e3.905 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-7.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e10.10:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eG9272500185\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09453905\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.50 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e11504-R1-8-H\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e3.905 IN\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e-7.00 CC\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e10.10:1\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eH9272500225\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e09453905\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e1.20 MM x 1.50 MM x 3.00 MM\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003e015104-32\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;text-align:left;border-bottom:1px solid #e5e9ed;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:0.9em;\"\u003eSelect the finished bore first, then a matching crown and nominal compression ratio, followed by an available gudgeon-pin specification. Pin choices depend on the selected bore and crown. Compression ratios are nominal catalogue figures; the final ratio depends on the measured chamber, deck and gasket volumes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv style=\"background:#f3f5f7;border-left:4px solid #0f536b;padding:14px 18px;margin:22px 0;\"\u003e\n\u003ch3 style=\"margin:0 0 8px;\"\u003eMade to order · delivery\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAllow approximately 5–6 weeks for delivery, pending Australian customs processing time.\u003c\/strong\u003e Manufacturing schedules, international freight and customs clearance may extend this estimate. Contact BBT before ordering for a build with a fixed deadline.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePlan your build with BBT\u003c\/h3\u003e\n\u003cp\u003eBoost \u0026amp; Tune can help coordinate the piston, rod and crank dimensions with your planned naturally aspirated or boosted LS build. Contact BBT with your engine code, measured bore, cylinder heads and target use before ordering if the combination is not already specified.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/bt-fit-engine-ls1\"\u003eLS1 engine parts\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"font-size:0.85em;color:#596773;\"\u003ePhotography shows a representative Diamond piston design. Crown shape, valve pockets, skirt finish and supplied components vary with the selected part number.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Diamond Pistons","offers":[{"title":"3.905 in \/ -7.00 cc \/ 10.10:1 nominal \/ Standard G-series","offer_id":67607064805443,"sku":"11504-R1-8","price":2724.0,"currency_code":"AUD","in_stock":true},{"title":"3.905 in \/ -7.00 cc \/ 10.10:1 nominal \/ H13 upgrade","offer_id":67607064838211,"sku":"11504-R1-8-H","price":2989.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/F26084_1887.jpg?v=1791010507"}],"url":"https:\/\/builtbyboostandtune.com.au\/collections\/bt-fit-engine-ls-4inch-stroke.oembed","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}