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8 Paxton supplied the lower crank pulley and it was the identical 6.65-inches as the six-rib one we removed. The outer pulley (top) is for the power steering pump, while the inside section (bottom) is used for the serpentine system. It is the inside section that measures 6.65 inches and effects supercharged impeller speed. A larger-diameter pulley will spin the blower harder, while a smaller-diameter pulley will slow it down.