This hub is for all internal balance BBC engines including 396, 402, 427, 454, 481x and many more. Hub measures from pulley mounting surface to crank gear 1.60".
Hub is designed to be used with large roots or screw blowers where crank hub galling is a issue and with two unlike materials the chance of welding the crank hub on is far less. Crank hub works with all flat RCD splined degree wheels.
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