Product details:
Underdrive Pulleys, Serpentine, Nodular Iron, Black Anodized, Crank, Alternator, Ford, Kit Engine Balance: Internal Safety Rating: SFI 18.1 Degree Markings: Yes Harmonic Balancer Material: Steel Harmonic Balancer Construction: Elastomer Harmonic Balancer Finish: Black powdercoated Mounting Hardware Included: No Quantity: Sold individually. Notes: Integral harmonic damper and crank pulley design provides a 25 percent underdrive.