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This gives you the ability to run a much stronger and reliable transmission to your high performance engine
superior corrosion resistance
The spacer is used to space out the auto starter so it will work on the toploader bellhousing
Speedmaster only offers planetary gear sets provide superior torque output for modern high-output motors
1.263" Od. 0.510" Id. 0.041" Thick Hardened Steel Valve Spring Seat LS1 This gives you the abilityAs 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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