Shown here is our billet aluminum underdrive crank pulley. With a diameter of 5.25", it's slightly smaller diameter than a factory crank pulley, which helps to keep from frying your water pump and alternator bearings at high RPM's, as well as freeing up some additional horsepower. These have one pulley bolt hole elongated so they'll fit on the '72 and later symmetrical bolt pattern, AND the earlier offset pattern! Machined from a solid piece of billet aluminum, you can't beat these for a great combination of performance, durability and good looks. And, of course we've got 'em at a price that can't be beat.
Use this single groove crank pulley with NON air conditioning, NON power steering setups. Don't forget our special 109-1517 attaching bolts (listed below.)