1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 They are an economical solution

They are an economical solution to replacing failure-prone stock supports

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

Injectors come complete and ready for installation with precision molded o-rings and fine-mesh fuel strainers

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

Oxygen sensors are vital components that help you adjust to your engine's fuel/air ratio via the electronic control unit (ECU)

1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 They are an economical solutionAs 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.