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Return to Parts List Category : L- AR Engineering Products ARE AR140 CRANK PULLEY SPACER 0.375 THICK BILLET ALUMINUM $50.00 AR140 is a 3/8 thick spacer for the crankshaft pulley on any Mopar V-8 engine.  This spacer is designed to move the crankshaft pulley outwards by 3/8 of an inch so the water pump will properly line up after installing a motor plate.  Pully spacer uses a universal 6 bolt mounting pattern to fit both early and later model engines.  Fits any big-block and Hemi engine.  AR140 is machined on both sides with ID and OD locating features to keep the crankshaft pulley concentric to the damper.