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They allow you to install Granada rotors and intermediate GM metric-style calipers
The crank sprockets have multiple keyways
Speedmaster aluminum pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs
as well as aftermarket control arms
and a direct clutch hub
GM Turbo 400 TH400 Aluminum Tailhousing with Bushing They allow you to installThese Speedmaster tailshaft housings are designed to fit the stock Turbo 400 transmissions. They are five times stronger and more ridged than stock because they are made from aircraft grade aluminum alloy. Featuring thicker walls and more gusseting than any other manufacturer.
