Uses six .375" bolts on a 2.782" bolt circle and is made to work with 4-71 thru 18-71 roots and screw superchargers. This hub is for all internal balance Hemi engines including 426, 440, KB, BAE, TFX and many more. Hub measures from pulley mounting surface to crank gear 1.200" and works with Bryant and Winberg crankshafts.
Splined hub take the place of the industry standard short crank hub and works with existing idler bracket and blower pulleys. Hub has a twenty six spline count and is considered the PSI spline.