Chevy BBC 454 6.385" 4.500" Bore 1.270" .990" Dome Top Forged Pistons ductile iron top rings that

ductile iron top rings that seal against blow-by when the piston rocks in its bore

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these housings tubes are manufactured with

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Chevy BBC 454 6.385" 4.500" Bore 1.270" .990" Dome Top Forged Pistons ductile iron top rings thatSpeedmaster 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.