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Superior engineering
Speedmaster designed a one-piece forged steel turbine hub to prevent ballooning
Standard valve sizes are 2
They start to make awesome power around 3
GM TH400 Turbo 400 Transmission Billet Aluminum Direct Drum Only Superior engineeringThis TH400 7075 T6 Billet Aluminum Direct Drum is manufactured specifically for drag racing. Includes a Billet aluminum piston. Drum weights 55% less than the OEM drum.
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