Chevy 400 427 Ford 351W Windsor 4.165" 1.015" Dished -16cc Forged Pistons When roller rocker arms are

When roller rocker arms are installed

Match your camshaft with Speedmaster iron distributor gears

High performance fuel injectors

They accurately measure camshaft centerline

Speedmaster has already done the work for you

Chevy 400 427 Ford 351W Windsor 4.165" 1.015" Dished -16cc Forged Pistons When roller rocker arms areSpeedmaster 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.