Chevy 400 427 Ford 351W Windsor 4.165" 1.015" Dished -16cc Forged Pistons Speedmaster billet aluminum spacers provide

Speedmaster billet aluminum spacers provide the benefits of an open carburetor spacer

they replace your existing worn or damaged valve guides

Bolts directly to torqueflite converters

but have profiled counterweights for less weight

Chevy 400 427 Ford 351W Windsor 4.165" 1.015" Dished -16cc Forged Pistons Speedmaster billet aluminum spacers provideSpeedmaster 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.