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Speedmaster billet main caps improve reliability in highly stressed engines by reducing distortion of the main bearing bores
Your street rod or show car deserves the very best
direct clutch failure and soft slide shift complaints caused by a worn sleeve
Upgrade your GM Powerglide or TH400 for extreme horsepower applications with this big shaft stator tube kit
1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 Speedmaster billet main caps improveAs 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.
