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THIS IS AN EXTENDER TO ADD A THIRD GROOVE TO A 2 GROOVE CRANK PULLY WHEN YOU ADD ON AIR TO A CAR.
NEWBig Block Mopar/Chrysler Add-On Pulley. Cast-Iron V-belt, 1 groove crank pulley. Fits Mopar/Chrysler 383, 400, 426 and 440 engines 1970+. Designed for use with Bracket part# 3010 Power Steering Setups.