The hub is made from billet heat treated steel, has two .250" keyways 180 degree's apart. Uses six .375" bolts on a 2.782" bolt circle and is made to work with 4-71 thru 18-71 roots or screw superchargers.
Hub measures from pulley mounting surface to crank gear 1.600" and has a long nose on the front to work with an external crank support.
End of crank hub is machined with a provision to drive a mandrel off the end of the crank if the racer chooses.
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