1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 Proper fuel pressure is critical

Proper fuel pressure is critical for adjusting your carburetor or fuel injection

Some applications feature a thicker deck to solve common warping or cracking issues

Speedmaster only offers planetary gear sets provide superior torque output for modern high-output motors

This gives you the ability to run a much stronger and reliable transmission to your high performance engine

These Speedmaster fuel pumps feature an improved design for street and strip applications

1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 Proper fuel pressure is criticalAs 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.