March GM Serpentine Performance Pulley Sets

Performance Series
Increases horsepower by reducing accessory drag (typically 12.5 HP at rear wheels) and eliminates belt throwing. Designed for normal street driving.

Power & Amp Series
Increases horsepower by reducing accessory drag (typically 11 HP at rear wheels). Designed for vehicles with automatic transmission or high-amperage need. Excellent for towing and stop-and-go driving.

Steel Pulleys are precision machined to run perfectly true. The high-carbon billet steel is covered with iron phosphate and then powdercoated high-gloss black polyester for maximum rust prevention.

Aluminum Pulleys are precision machined from 6061-T6 billet aluminum for extra strength and wear. They are hand polished and powdercoated clear or black for a maintenance-free finish.