1.370" Od. 0.760" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs This TH400 7075-T6 Billet Aluminum

This TH400 7075-T6 Billet Aluminum Direct Drum is manufactured specifically for drag racing

These Speedmaster aluminum water pump pulleys are made from a 356 aluminum-alloy that is heat-treated to T-6 specs

ensure optimal performance and reliability

If you don't want any breather holes drilled

Add a cool new look to your ride and lower your curb weight with Speedmaster control arms

1.370" Od. 0.760" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs This TH400 7075-T6 Billet AluminumAs 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.