{"title":"Yella Terra Holden 304 \/ 5.0 Roller Rockers","description":"\u003cp\u003e\u003cstrong\u003eYella Terra shaft-mount roller rockers for Holden 304 \/ 5.0L EFI V8 engines\u003c\/strong\u003e, including Pro Street, Platinum and RPM configurations.\u003c\/p\u003e\u003cp\u003eConfirm rocker ratio, stud\/adaptor arrangement, valve-train geometry and cylinder-head compatibility on the individual product page. Built by Boost \u0026amp; Tune can assist with engine and valvetrain setup.\u003c\/p\u003e","products":[{"product_id":"yella-terra-holden-304-efi-v8-rpm-1-65-shaft-rockers-yt-6797","title":"Yella Terra Holden 304 \/ 5.0L EFI V8 RPM 1.65:1 Shaft-Mount Roller Rockers — YT 6797","description":"\u003cp\u003eYella Terra’s RPM shaft-mount rocker system is a performance replacement for Holden 304 \/ 5.0L EFI V8 engines using VN-style cylinder heads. The 1.65:1 hydraulic full-roller design combines low oscillating mass with a rigid common-shaft layout for street and high-RPM applications.\u003c\/p\u003e\u003ch3\u003eConstruction and valvetrain control\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSet of 16 Australian-manufactured and assembled roller rockers.\u003c\/li\u003e\n\u003cli\u003e1.65:1 rocker ratio with 5\/16 in mounting hardware.\u003c\/li\u003e\n\u003cli\u003eYella Terra rates the set to 400 lb maximum open spring pressure.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement bearings and precision-ground trunnions are designed for oscillating rocker loads.\u003c\/li\u003e\n\u003cli\u003eAircraft-grade aluminium arms reduce valvetrain mass and assist heat dissipation.\u003c\/li\u003e\n\u003cli\u003eHardened chromoly roller tips reduce valve-tip and guide wear.\u003c\/li\u003e\n\u003cli\u003eCommon-shaft mounting increases rocker stability and clamp footprint.\u003c\/li\u003e\n\u003cli\u003eYella Terra states approximately 50% less oscillating nose weight than the factory rocker arrangement.\u003c\/li\u003e\n\u003cli\u003eShim set is included and the system is designed to fit beneath factory rocker covers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003ePushrod length:\u003c\/strong\u003e Yella Terra advises checking pushrod length when the engine no longer uses a standard camshaft\/lifter combination.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Holden 304 \/ 5.0L EFI V8 combinations using VN-style heads. Confirm valve-train geometry and clearances during installation.\u003c\/p\u003e\u003ch2\u003eBrand\u003c\/h2\u003e\u003cp\u003eYella Terra\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHolden Commodore Vn Vr 5 0 Efi V8\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vs 5 0 Efi V8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eManufacturer Part Number\u003c\/h2\u003e\u003cp\u003eYT 6797\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","brand":"Yella Terra","offers":[{"title":"Default Title","offer_id":43816781283395,"sku":"YT 6797","price":980.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/untitled_1_of_8__79180.1781059898.jpg?v=1789166463"},{"product_id":"yella-terra-holden-304-5-0-efi-pro-street-1-65-shaft-rockers-yt6309","title":"Yella Terra Holden 304 \/ 5.0L EFI V8 Pro Street 1.65:1 Shaft-Mount Roller Rockers — YT 6309","description":"\u003cp\u003eYella Terra’s Pro Street shaft-mount roller rocker system is designed for high-revving street and strip Holden EFI V8 combinations using VN-style cylinder heads. The 1.65:1 adjustable full-roller design uses the heavy-duty bearing and trunnion architecture derived from Yella Terra’s Platinum race series.\u003c\/p\u003e\u003ch3\u003ePro Street construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSet of 16 adjustable full-roller aluminium rocker arms.\u003c\/li\u003e\n\u003cli\u003e1.65:1 rocker ratio.\u003c\/li\u003e\n\u003cli\u003emanufacturer-rated to less than 600 lb maximum open spring pressure.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement caged bearings and precision-ground trunnions are designed for oscillating rocker loads.\u003c\/li\u003e\n\u003cli\u003eBalanced CNC billet \/ aircraft-grade aluminium arms provide strength with controlled valvetrain mass.\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 rigidity and clamp footprint.\u003c\/li\u003e\n\u003cli\u003eMaximum spring diameter: 1.437 in.\u003c\/li\u003e\n\u003cli\u003eShim set included.\u003c\/li\u003e\n\u003cli\u003eSuitable for hydraulic and solid camshaft combinations when set up correctly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eEasy-Fit configuration:\u003c\/strong\u003e Uses the factory-size 5\/16-inch bolt-down mounting points and is designed as a direct shaft-system replacement without cylinder-head machining.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Holden 304 \/ 5.0L EFI V8 combinations using VN-style cylinder heads. Confirm the cylinder-head rocker-post machining and mounting-thread configuration before ordering.\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHolden Commodore Vn Vr 5 0 Efi V8\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vs 5 0 Efi V8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eManufacturer Part Number\u003c\/h2\u003e\u003cp\u003eYT 6309\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","brand":"Yella Terra","offers":[{"title":"Default Title","offer_id":43816979562563,"sku":"YT 6309","price":1295.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/IMG_8686__29513.1657001348.jpg?v=1789167614"},{"product_id":"yella-terra-holden-304-5-0-efi-pro-street-1-65-7-16-adaptor-rockers-yt6309a","title":"Yella Terra Holden 304 \/ 5.0L EFI V8 Pro Street 1.65:1 7\/16 Adaptor Shaft Rockers — YT 6309A","description":"\u003cp\u003eYella Terra’s Pro Street shaft-mount roller rocker system is designed for high-revving street and strip Holden EFI V8 combinations using VN-style cylinder heads. The 1.65:1 adjustable full-roller design uses the heavy-duty bearing and trunnion architecture derived from Yella Terra’s Platinum race series.\u003c\/p\u003e\u003ch3\u003ePro Street construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSet of 16 adjustable full-roller aluminium rocker arms.\u003c\/li\u003e\n\u003cli\u003e1.65:1 rocker ratio.\u003c\/li\u003e\n\u003cli\u003emanufacturer-rated to less than 600 lb maximum open spring pressure.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement caged bearings and precision-ground trunnions are designed for oscillating rocker loads.\u003c\/li\u003e\n\u003cli\u003eBalanced CNC billet \/ aircraft-grade aluminium arms provide strength with controlled valvetrain mass.\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 rigidity and clamp footprint.\u003c\/li\u003e\n\u003cli\u003eMaximum spring diameter: 1.437 in.\u003c\/li\u003e\n\u003cli\u003eShim set included.\u003c\/li\u003e\n\u003cli\u003eSuitable for hydraulic and solid camshaft combinations when set up correctly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e7\/16-inch pedestal adaptor configuration\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eIncludes Yella Terra’s special 5\/16-to-7\/16 pedestal adaptor kit.\u003c\/li\u003e\n\u003cli\u003eDesigned for VN-style heads where the rocker mounting posts have already been machined for 7\/16-inch UNC screw-in threads.\u003c\/li\u003e\n\u003cli\u003eYella Terra specifies the factory posts are typically machined lower by approximately 0.280–0.310 in for this configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Holden 304 \/ 5.0L EFI V8 combinations using VN-style cylinder heads. Confirm the cylinder-head rocker-post machining and mounting-thread configuration before ordering.\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHolden Commodore Vn Vr 5 0 Efi V8\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vs 5 0 Efi V8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eManufacturer Part Number\u003c\/h2\u003e\u003cp\u003eYT 6309A\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","brand":"Yella Terra","offers":[{"title":"Default Title","offer_id":43816981233731,"sku":"YT 6309A","price":1480.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/IMG_8686__89324.1545095333.jpg?v=1789167620"},{"product_id":"yella-terra-holden-304-5-0-efi-platinum-1-75-high-ratio-rockers-yt6767","title":"Yella Terra Holden 304 \/ 5.0L EFI V8 Platinum 1.75:1 High-Ratio Shaft-Mount Roller Rockers — YT 6767","description":"\u003cp\u003eYella Terra’s Platinum 1.75:1 high-ratio shaft rocker set is a race-oriented valvetrain upgrade for Holden EFI V8 engines using VN-style cylinder heads. The higher rocker ratio increases valve lift without relying entirely on more aggressive camshaft lobe lift.\u003c\/p\u003e\u003ch3\u003ePlatinum high-ratio construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSet of 16 adjustable full-roller aluminium rocker arms.\u003c\/li\u003e\n\u003cli\u003eHigh 1.75:1 rocker ratio.\u003c\/li\u003e\n\u003cli\u003eWide-body aircraft-grade aluminium arms for high-RPM stiffness and resistance to deflection.\u003c\/li\u003e\n\u003cli\u003emanufacturer technical table lists less than 900 lb maximum open spring pressure.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement caged bearings with precision-ground trunnions.\u003c\/li\u003e\n\u003cli\u003eHardened chromoly roller tips.\u003c\/li\u003e\n\u003cli\u003eSupplied with 2-inch 7\/16-inch capscrews and matching pedestals.\u003c\/li\u003e\n\u003cli\u003eMaximum spring diameter: 1.550 in.\u003c\/li\u003e\n\u003cli\u003eShim set included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003emanufacturer warnings and machining\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYella Terra separately states a maximum recommended spring seat pressure of 380 lb for this application; seat pressure and open pressure are different measurements and both limits must be respected.\u003c\/li\u003e\n\u003cli\u003eRemove approximately 0.300 in from the rocker pads and drill\/tap the mounting points to 7\/16-inch UNC.\u003c\/li\u003e\n\u003cli\u003eRequires Yella Terra YT 5132 10 mm valve-cover spacer.\u003c\/li\u003e\n\u003cli\u003eYella Terra notes localised head clearancing may be required because of casting variation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Holden 304 \/ 5.0L EFI V8 combinations using VN-style heads. Because this is a high-ratio rocker, verify final valve lift, retainer-to-seal clearance, pushrod geometry and piston-to-valve clearance before operation.\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHolden Commodore Vn Vr 5 0 Efi V8\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vs 5 0 Efi V8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eManufacturer Part Number\u003c\/h2\u003e\u003cp\u003eYT 6767\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","brand":"Yella Terra","offers":[{"title":"Default Title","offer_id":43816982609987,"sku":"YT 6767","price":1550.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/IMG_8601__84520.1659676783.jpg?v=1789167629"},{"product_id":"yella-terra-holden-304-5-0-efi-platinum-1-65-shaft-rockers-yt6030","title":"Yella Terra Holden 304 \/ 5.0L EFI V8 Platinum 1.65:1 7\/16 Shaft-Mount Roller Rockers","description":"\u003cp\u003eYella Terra’s Platinum 1.65:1 shaft-mount race rocker system is the heavy-duty wide-body option for Holden EFI V8 engines using VN-style cylinder heads. It is intended for combinations requiring substantially greater valvetrain stiffness and spring capacity than the lighter street-oriented rocker families.\u003c\/p\u003e\u003ch3\u003ePlatinum race construction\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSet of 16 adjustable full-roller aluminium rocker arms.\u003c\/li\u003e\n\u003cli\u003e1.65:1 rocker ratio.\u003c\/li\u003e\n\u003cli\u003eWide-body aircraft-grade aluminium arms for increased strength and resistance to deflection.\u003c\/li\u003e\n\u003cli\u003emanufacturer-rated to 900 lb maximum open spring pressure.\u003c\/li\u003e\n\u003cli\u003eOversize full-complement caged bearings and precision-ground trunnions.\u003c\/li\u003e\n\u003cli\u003eHardened chromoly roller tips.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty 7\/16-inch shaft-mount hardware.\u003c\/li\u003e\n\u003cli\u003eMaximum spring diameter: 1.550 in.\u003c\/li\u003e\n\u003cli\u003eShim set included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eRequired cylinder-head machining\u003c\/h3\u003e\u003cp\u003eYella Terra specifies removing approximately 0.300 in from the rocker pads and drilling\/tapping the mounting points to 7\/16-inch UNC for the Platinum system. Professional installation and geometry checking are strongly recommended.\u003c\/p\u003e\u003ch3\u003eHardware configurations\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYT 6030:\u003c\/strong\u003e 2.0-inch 7\/16-inch capscrews and standard pedestal arrangement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYT 6030A:\u003c\/strong\u003e 2.25-inch 7\/16-inch capscrews with 25 mm pedestals; Yella Terra identifies this as a common upgrade for aftermarket alloy heads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYT 6030B:\u003c\/strong\u003e 2.5-inch 7\/16-inch capscrews with 30 mm pedestals.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Holden 304 \/ 5.0L EFI V8 combinations using VN-style cylinder-head architecture. Select the hardware\/pedestal configuration to match the actual cylinder head and machining.\u003c\/p\u003e\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHolden Commodore Vn Vr 5 0 Efi V8\u003c\/li\u003e\n\u003cli\u003eHolden Commodore Vs 5 0 Efi V8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eConfirm chassis, engine, drivetrain and production-year compatibility before ordering.\u003c\/p\u003e\u003ch2\u003eAvailable Options\u003c\/h2\u003e\u003ch3\u003eHardware \u0026amp; Pedestal Configuration\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYT6030 — 2.0in Capscrews + Standard Pedestals\u003c\/li\u003e\n\u003cli\u003eYT6030A — 2.25in Capscrews + 25mm Pedestals\u003c\/li\u003e\n\u003cli\u003eYT6030B — 2.5in Capscrews + 30mm Pedestals\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eManufacturer Part Numbers\u003c\/h2\u003e\u003cp\u003eYT 6030, YT 6030A, YT 6030B\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","brand":"Yella Terra","offers":[{"title":"YT6030 — 2.0in Capscrews + Standard Pedestals","offer_id":43817098575939,"sku":"YT 6030","price":1550.0,"currency_code":"AUD","in_stock":true},{"title":"YT6030A — 2.25in Capscrews + 25mm Pedestals","offer_id":43817098608707,"sku":"YT 6030A","price":1550.0,"currency_code":"AUD","in_stock":true},{"title":"YT6030B — 2.5in Capscrews + 30mm Pedestals","offer_id":43817098641475,"sku":"YT 6030B","price":1550.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/IMG_8601__02208.1683180204.jpg?v=1789169787"}],"url":"https:\/\/builtbyboostandtune.com.au\/collections\/yella-terra-holden-304-roller-rockers.oembed","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}