March Performance Pulleys are precision machined to run perfectly true. Two-piece kits are machined from high carbon billet steel and coated with iron phosphate then covered with high gloss black polyester powdercoat for maximum rust prevention. Their aluminum sets are CNC machined from 6061-T6 billet for extra strength and wear. Hand polished and finished with "No Polishing" clear powdercoat.

The Performance Series increase horsepower by reducing accessory drag. They eliminate belt throwing and are designed for normal street driving. Expect as much as an 12.5 HP increase at the rear wheels!

These Power & Amp series pulleys are available in the following kits (Please select in the drop-down menu below - Picture may be a representation):

4020 - 1985-1987 5.0/5.7L 2-Piece Steel Kit (Crank Pulley & Alternator Pulley)
4030 - 1985-1987 5.0/5.7L 3-Piece Aluminum Kit (Crank Pulley, Water Pump Pulley, & Alternator Pulley w/Cover)
4000 - 1988-1992 5.0/5.7L 2-Piece Steel Kit (Crank Pulley & Alternator Pulley)
4010 - 1988-1992 5.0/5.7L 3-Piece Aluminum Kit (Crank Pulley, Water Pump Pulley, & Alternator Pulley w/Cover