Chevy BBC 454 6.385" 4.280" Bore 1.270" .990" Dome Top Forged Pistons Made from heavy-gauge metal with

Made from heavy-gauge metal with a silkscreen finish for long-lasting use

These crankshafts feature profiled aero-wing counterweights and have straight shot and chamfered oil holes

The Speedmaster Exhaust Gasket sets are designed for high-performance sealing and durability

while Cleveland/Modified applications use precision laser-cut steel for a factory-style fit and finish

which is much stronger than stock steel and mates better with an aluminum case

Chevy BBC 454 6.385" 4.280" Bore 1.270" .990" Dome Top Forged Pistons Made from heavy-gauge metal withSpeedmaster 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.