March Performance Pulley Kit, Ultra, 6-Rib Serpentine, Aluminum, Clear Powdercoat, 1969-1/2 & Later Small Block Ford (4-Bolt Damper)

March Performance Ford Windsor serpentine kits are made to fit perfectly and handle high-torque and vibration. Matching serpentine pulleys are precision CNC-machined from 6061 T-6 aluminum and have a maintenance-free, clear powdercoated finish. These high-tensile strength pulleys will not fracture like common cast pulleys, since they are made for much longer wear. The high-wear areas are hard coated to "65" Rockwell (harder than steel)! Their street rod ratio increases water flow and fan speed, which is recommended for daily drivers.