{"product_id":"yella-terra-series-2-3800-l67-ultralite-1-95-shaft-rockers-yt6662","title":"Yella Terra Holden\/Buick Series 2 3800 L67 Ultralite 1.95:1 5\/16in Shaft Roller Rockers — YT 6662","description":"\u003cp\u003eYella Terra’s Ultralite shaft and pedestal roller rocker system is a bolt-on hydraulic valvetrain upgrade for Series II 3.8L 3800 engines including the Holden L67 supercharged V6. This set uses a 1.95:1 rocker ratio with 5\/16-inch mounting hardware and a common-shaft layout.\u003c\/p\u003e\u003ch3\u003eUltralite construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSupplier-rated to approximately 380 lb maximum open spring pressure for this application.\u003c\/li\u003e\n\u003cli\u003eSet of 12 full-roller aluminium rocker arms.\u003c\/li\u003e\n\u003cli\u003eApproximately 50% less oscillating nose weight than the factory rocker arrangement, supporting greater RPM potential and improved valve-float control.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement caged bearings are designed for oscillating rocker loads.\u003c\/li\u003e\n\u003cli\u003eOversize precision-ground trunnions reduce friction and improve bearing support.\u003c\/li\u003e\n\u003cli\u003eAircraft-grade extruded aluminium arms improve strength-to-weight ratio and dissipate top-end heat.\u003c\/li\u003e\n\u003cli\u003eHardened and ground chromoly roller tips reduce valve-tip and guide wear.\u003c\/li\u003e\n\u003cli\u003eCommon-shaft mounting increases the clamping footprint without cylinder-head machining for the standard installation.\u003c\/li\u003e\n\u003cli\u003eFits beneath the factory rocker covers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eImportant pushrod requirement\u003c\/h3\u003e\u003cp\u003eYella Terra specifies its matching pushrods, part number \u003cstrong\u003eYT 14103-12\u003c\/strong\u003e, sold separately. Pushrod length should still be measured and verified as part of the hydraulic rocker setup.\u003c\/p\u003e\u003ch3\u003eTechnical specification\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eRocker ratio: 1.95:1.\u003c\/li\u003e\n\u003cli\u003eMounting: bolt-on single shaft \/ pedestal system.\u003c\/li\u003e\n\u003cli\u003eMounting hardware: 5\/16 in.\u003c\/li\u003e\n\u003cli\u003eOperation: hydraulic.\u003c\/li\u003e\n\u003cli\u003eMaximum spring diameter: 1.437 in.\u003c\/li\u003e\n\u003cli\u003eShims included: no.\u003c\/li\u003e\n\u003cli\u003eQuantity: set of 12.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e Always verify rocker geometry, pushrod length, retainer\/spring clearance and piston-to-valve clearance for the complete camshaft and cylinder-head combination.\u003c\/p\u003e\u003ch2\u003eProduct System\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eEngine Parts\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHolden Commodore Vs L67\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vt Vt Ii L67\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vx L67\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vy L67\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eBuilt by Boost \u0026amp; Tune Support\u003c\/h2\u003e\u003cp\u003eBBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.\u003c\/p\u003e","brand":"Yella Terra","offers":[{"title":"Default Title","offer_id":43816974549059,"sku":"YT 6662","price":900.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/YT6662__64768.1730349711.jpg?v=1789167585","url":"https:\/\/builtbyboostandtune.com.au\/products\/yella-terra-series-2-3800-l67-ultralite-1-95-shaft-rockers-yt6662","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}