Chevy BBC 454 6.385" 4.280" Bore 1.270" .990" Dome Top Forged Pistons These crankshafts feature profiled aero-wing

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

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

Made from 5051 aircraft aluminum alloy

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

these cams provide better throttle response and more top-end horsepower than equivalent cams from other manufacturers

Chevy BBC 454 6.385" 4.280" Bore 1.270" .990" Dome Top Forged Pistons These crankshafts feature profiled aero-wingSpeedmaster 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.