1.560" Od. 0.567" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs providing competition engine builders with

providing competition engine builders with the most accurate valvetrain components available today

They are manufactured from billet aluminum and require no drilling or welding for installation

The right choice is critical for your engine and your wallet--choose Speedmaster iron distributor gears

With these easy-to-install kits

The crank sprockets have multiple keyways

1.560" Od. 0.567" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs providing competition engine builders withAs with all other parts in the valvetrain, the area where the spring sits takes a beating. The old standard shims simply will not hold up to the extreme pressures and high rpm found in today's performance engines. Speedmaster offers this set of valve spring shims to solve this problem and eliminate failures.