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They also help to insulate the carburetor from engine heat and provide clearance for linkages
like lower cost steel ones
Speedmaster one piece silicone rear main seal
All the factory flaws redesigned to be eliminated
Speedmaster camshafts are built to take advantage of the latest cam technology
1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 They also help to insulateAs 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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