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low-resistance
aluminum heads can accept a 2
Speedmaster valve guides are constructed from high-quality bronze for durability and wear
heat-treated to a maximum strength of 190
Chevy BBC 454 6.385" 4.290" Bore 1.270" .990" Dome Top Forged Pistons low-resistanceSpeedmaster Forged pistons are made from 4032 aluminum alloy for quieter operation and reduced piston to wall clearance. Up to 20% lighter than traditional forged pistons that eliminate harmful stress concentrations for superior strength. Specifically designed for naturally aspirated or moderate nitrous applications.
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