1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 They are quality-manufactured from stainless

They are quality-manufactured from stainless steel and are available in 18 to 80 oz

it will be stated with the part

Upgrade your GM Powerglide or TH400 for extreme horsepower applications with this big shaft stator tube kit

direct clutch failure and soft slide shift complaints caused by a worn sleeve

to maintain accurate valvetrain adjustment

1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 They are quality-manufactured from stainlessAs 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.