*** IN STOCK SHIPS TODAY *** BBC counter balanced crank hub made from billet heat treated steel, one .250" and one .187" keyway 180 degree's apart. This hub is for all external balance BBC engines including 454 and many more. Hub measures from pulley mounting surface to crank gear 1.750".
Uses a 2.00" register with a 2.782" bolt circle with six 3/8-16" bolt holes and is made to work with 4-71 thru 16-71 superchargers.
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