{"product_id":"yella-terra-ls1-ls2-ultralite-pro-1-85-8mm-shaft-rockers-yt-6723","title":"Yella Terra GM LS1\/LS2 Ultralite Pro 1.85:1 8mm Shaft-Mount Roller Rockers — YT 6723","description":"\u003cp\u003eYella Terra’s Ultralite Pro shaft-mount roller rocker system is a lightweight, high-strength valvetrain upgrade for LS1\/LS2 applications. This set uses a 1.85:1 rocker ratio with 8 mm mounting hardware and combines low oscillating mass with a rigid common-shaft layout for street and performance engines.\u003c\/p\u003e\u003ch3\u003eUltralite Pro construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSet of 16 full-roller aluminium rocker arms.\u003c\/li\u003e\n\u003cli\u003eAircraft-grade extruded aluminium rocker bodies help reduce valvetrain mass and dissipate top-end heat.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement caged bearings are designed specifically for oscillating rocker loads.\u003c\/li\u003e\n\u003cli\u003eOversize precision-ground trunnions reduce friction and improve support.\u003c\/li\u003e\n\u003cli\u003eHardened and ground chromoly roller tips reduce valve-tip and guide wear.\u003c\/li\u003e\n\u003cli\u003eCommon-shaft inlet\/exhaust mounting increases the clamping footprint and rocker stability.\u003c\/li\u003e\n\u003cli\u003eYella Terra rates the Ultralite Pro design to 480 lb maximum open spring pressure.\u003c\/li\u003e\n\u003cli\u003eThe supplier states approximately 50% less oscillating nose weight than the factory rocker system, supporting greater RPM potential and improved valve-float control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve-cover clearance:\u003c\/strong\u003e Requires Yella Terra YT 5132 10 mm valve-cover spacer.\u003c\/li\u003e\n\u003cli\u003eYella Terra notes that variation in GM cylinder-head castings can require localised clearancing; verify clearance during installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical specification\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eRocker ratio: 1.85:1\u003c\/li\u003e\n\u003cli\u003eMounting: shaft mount, 8 mm capscrew.\u003c\/li\u003e\n\u003cli\u003eOperation: hydraulic.\u003c\/li\u003e\n\u003cli\u003eMaximum spring diameter: 1.437 in.\u003c\/li\u003e\n\u003cli\u003eInlet offset: No.\u003c\/li\u003e\n\u003cli\u003eQuantity: set of 16.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e Correct pushrod length, geometry, spring clearance and piston-to-valve clearance must be checked for the complete camshaft\/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\u003eChevrolet Corvette C5 Ls1\u003c\/li\u003e\n\u003cli\u003eChevrolet Corvette C6 Ls2\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Ve Ls2\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vt Vt Ii Ls1\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vx Ls1\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vy Ls1\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vz Ls1\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vz Ls2\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eSupplier Part Number\u003c\/h2\u003e\u003cp\u003eYT 6723\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":43816777121859,"sku":"YT 6723","price":1050.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/ULTRALITE_PRO__87702.1512707674.jpg?v=1789166437","url":"https:\/\/builtbyboostandtune.com.au\/products\/yella-terra-ls1-ls2-ultralite-pro-1-85-8mm-shaft-rockers-yt-6723","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}