1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 Upgrade your GM Powerglide or

Upgrade your GM Powerglide or TH400 for extreme horsepower applications with this big shaft stator tube kit

direct clutch failure and soft slide shift complaints caused by a worn sleeve

The Speedmaster throttle body begins as a billet of 6061- T6 aluminum for superior quality and is introduced to a state-of-the-art CNC machine

These Speedmaster alternator brackets are constructed from billet aluminum for durability and can be used with several different alternators

this high-performance oil pan is fabricated to meet the demanding needs of top fuel and alcohol applications

1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 Upgrade your GM Powerglide orAs 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.