March Performance 623 - March GM Pulleys

Computer design assures your electrical and cooling systems run properly while your engine run easier and their deep grooves eliminate belt throwing. CNC machined from solid billet aircraft-grade materials with a maintenance-free black or clear polished powder coat finish.

Performance Series:
Increases horsepower by reducing accessory drag. Typical 12.5HP at the rear wheels.

Power and Amp Series:
Designed for vehicles with high amperage needs. Excellent for towing and heavy stop and go driving. Increases horsepower by reducing accessory drag. Typical 11HP at the rear wheels.