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Paper Air Cleaners & Kits also available
These Performance Automatic hardened input shafts are custom-forged from 9310 non-twist steel
Speedmaster billet main caps improve reliability in highly stressed engines by reducing distortion of the main bearing bores
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
Your street rod or show car deserves the very best
1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 Paper Air Cleaners & KitsAs 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.
