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Speedmaster Steel main girdles are machined from 1045 steel
They provide higher power and torque transmission
That means you get more airflow headed down the carburetor or throttle body and into the combustion chamber
or choke control to restrict airflow
This gives you the ability to run a much stronger and reliable transmission to your high performance engine
Chevy 400 427 Ford 351W Windsor 4.125" 1.015" Dished -16cc Forged Pistons Speedmaster Steel main girdles 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.
