Uses six .375" bolt holes on a 2.782" bolt circle with an 2.00" pulley register and is made to work with 4-71 thru 16-71 roots superchargers. Hub measures from pulley mounting surface to crank gear 2.900".
Hub does includes a piece of timing tape. RBS can provide a 7.00" bolt on degree ring for additional cost #2300-0032.
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