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Speedmaster billet main caps improve reliability in highly stressed engines by reducing distortion of the main bearing bores
Upgrade your GM Powerglide or TH400 for extreme horsepower applications with this big shaft stator tube kit
Paper Air Cleaners & Kits also available
They are quality-manufactured from stainless steel and are available in 18 to 80 oz
These Speedmaster alternator brackets are constructed from billet aluminum for durability and can be used with several different alternators
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.
