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The Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise
Specialized high temperature epoxy resists shock and vibration
The key to a cooler and longer-lasting transmission is simple Speedmaster dual pass transmission coolers
Manufactured with lightweight aluminum technology
Chevy BBC 454 6.385" 4.250" Bore 1.270" .990" Dome Top Forged Pistons The Speedmaster MidRise Air designSpeedmaster 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.
