1.550" Od. 0.567" Id. 0.060" Thick Hardened Steel Valve Spring Seat Springs These Performance Automatic hardened input

These Performance Automatic hardened input shafts are custom-forged from 9310 non-twist steel

a gilmer kit is a must for street or strip engines

Designed to work with PCE628

with these Speedmaster polished aluminum differential covers

This offers strength and no thrusting while torque is applied

1.550" Od. 0.567" Id. 0.060" Thick Hardened Steel Valve Spring Seat Springs These Performance Automatic hardened inputAs 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.