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The impeller and cavity have been custom CAD designed and engineered to be larger and more efficient to provide flow that is 40 percent greater than stock pumps
Tthese Speedmaster aluminum water pump pulleys
Chevy Caprice
Just bolt the pre-assembled unit to the back of the shifter and you are ready to go
Pontiac Firebird
GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] The impeller and cavity haveAlmost 10% larger that stock intermediate piston, the increased diameter applies more clamping force on the second gear clutch pack. Reducing the possibility of driving through the clutches as the power curve comes on strong. The stock 5. 617 center support piston has be increased by 0. 250" to 5. 867 in diameter.
