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The Billet Aluminum Drum wtih Extra Large sprag utilizes OEM intermediate frictions & steels
That latter characteristic translates into increased ground
Speedmaster camshafts are built to take advantage of the latest cam technology
All the factory flaws redesigned to be eliminated
1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 The Billet Aluminum Drum wtihAs 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.
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