Chevy SBC 383 ci 6.0" 4.040" 1.125" 0.927" Flat Top Forged Pistons These combinations start with a

These combinations start with a reliable Speedmaster 9

designed for twin barrel carbys

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along with energy-efficient and cost-effective friction management

power and economy

Chevy SBC 383 ci 6.0" 4.040" 1.125" 0.927" Flat Top Forged Pistons These combinations start with aSpeedmaster 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.