1.640" Od .710" Id .040" Thick Hardened Steel Valve Spring Cups Ps8005 Springs Designed for precision fitment and

Designed for precision fitment and easy installation

and high grade nuts

self-service-able to easily change your stall speed right at home

These drives fit under your stock timing cover and come complete with instructions

which consists of a tilt lever

1.640" Od .710" Id .040" Thick Hardened Steel Valve Spring Cups Ps8005 Springs Designed for precision fitment andAs 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.