BBF crank hub, made from billet heat treated steel, has two .250" keyways 180 degree's apart. Uses 2.782" bolt circle and is made to work with 6-71 thru 16-71 roots superchargers. Included in this kit is a hub, alum. degree ring with 360 degree's of marks, six grade eight bolts and washers.
This hub is for all internal balance BBF engines including 351, 429, 460 and many more. Hub measures from pulley mounting surface to crank gear 2.130".
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