Chevy BBC 454 6.385" 4.290" Bore 1.270" .990" Dome Top Forged Pistons Speedmaster valve guides are constructed

Speedmaster valve guides are constructed from high-quality bronze for durability and wear

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Speedmaster replacement parts that you need to keep your looking and operating at the highest standard

heat-treated to a maximum strength of 190

Chevy BBC 454 6.385" 4.290" Bore 1.270" .990" Dome Top Forged Pistons Speedmaster valve guides are constructedSpeedmaster 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.