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heat-treated to the highest Rockwell hardness available
The air flowing under the plenum provides a cooler charge for the incoming air with less heat transfer from the engine
Speedmaster pinion depth shims allow you to seat your pinion gear perfectly
The Speedmaster 9" solid pinion bearing spacer kit is designed to retain the pinion depth settings for greater strength and reliability
Ford 351W Windsor 408 434 ci 4.020" 1.250" 0.927" Flat Top Forged Pistons heat-treated to the highest RockwellSpeedmaster 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.
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