1.370" Od. 0.760" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs Speedmaster HPC ignition coils are

Speedmaster HPC ignition coils are designed for high-rpm

Speedmaster flexplates will withstand the extreme power and rpm of today's engines

Speedmasterª & FAST line of EFI systems are all you need when deciding to upgrade your engine to modern electronic fuel injection

valve cover gaskets

Speedmaster carburetor brackets are precision-stamped and chrome plated for a functional

1.370" Od. 0.760" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs Speedmaster HPC ignition coils areAs 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.