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The Speedmaster GM LS1/LS2/LS6 Modular Hi-Ram Intake Manifold is introduced as a cost effective alternative to fabricated sheet-metal for high-performance applications where induction system height is not limited
They fit carburetors with 5 1/8 in
they're guaranteed for life
and longevity
Made from steel
1.550" Od. 0.567" Id. 0.060" Thick Hardened Steel Valve Spring Seat Springs The Speedmaster GM LS1/LS2/LS6 ModularAs 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.
