Yella Terra YT5010-1 Single 7/16" Stud Mount 1.65:1 Roller Rocker Holden 253-308

YELLA TERRA SINGLE 7/16" STUD MOUNT 1.65:1 ROLLER ROCKER HOLDEN 253-308 YT5010-1Yella Terra Roller Rockers have proven to be so reliable and durable since 1983, with the ultimate in design and proven by official Holden racing teams such as NASCAR, AUSCAR and Commodore cup to give more power and reliability than other products. They are the strongest aluminium rocker arms in the world with deflection and bend tests proving their aircraft grade extruded aluminium arms superior to rival aluminium and stainless steel arms. They are the ultimate rocker arm for use in high revving street engines and most race applications. Premium quality Yella Terra extruded alumiunum roller rockers have never let a competitor down at thier high speed proving grounds (Calder Park Thunderdome), where Holden and Ford Auscars are required to run roller rockers having battled in racing at an average speed of over 200km for an estimated 100,000 laps. The rockers ran for over 170,000 km at between 5000-6500 rpm These products are internationally sold and acclaimed and have a superior design with super strong arms which are fully machined from heat treated certified aircraft alloy extrusion. They are fitted with hugh needle roller bearings mated to precision ground trunnions/shafts to reduce friction and increase engine power. Friction fighting roller tips minimize valve stem and guide wear and give a smoother quieter operation, correct geometry improves efficiency by ensuring maximum camshaft lift is achieved. Quite simply, these are the best rockers money can buy!Specs:Application: Holden V8 253-308 with factory iron & Yella Terra Alloy heads. Holden 5.0-5.7L EFI VL-VT Series IRocker Type: 7/16" Stud MountAdjustable: YesRatio: 1.65:1Rocker Series: Yella TerraQuantity: Sold individuallyNotes: Machining for screw in studs and guide plates required.