1.560" Od. 0.567" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs These valve bodies feature a

These valve bodies feature a newly designed top and bottom billet CNC-machined construction for maximum precision and durability

Speedmaster single Keyway Double Row Timing Chain Kits are CNC Machined from billet

it has a square bore carb flange instead of a spread bore

These headers are designed with 5/16 in

1.560" Od. 0.567" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs These valve bodies feature aAs 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.