1.550" Od. 0.567" Id. 0.060" Thick Hardened Steel Valve Spring Seat Springs with these Speedmaster polished aluminum

with these Speedmaster polished aluminum differential covers

circuit racing and made to withstand extreme use

a gilmer kit is a must for street or strip engines

They are made from stamped steel and feature a chrome plated finish for good looks and durability

1.550" Od. 0.567" Id. 0.060" Thick Hardened Steel Valve Spring Seat Springs with these Speedmaster polished 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.