1.370" Od. 0.760" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs They are manufactured from top-quality

They are manufactured from top-quality cast iron

but it is near impossible to break

which can be easily installed in any stock hose or metal fuel line

red/blue anodized finish to last for the life of your ride

1.370" Od. 0.760" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs They are manufactured from top-qualityAs 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.