Important Warning Concerning Crankshaft Pulleys: Stock replacement pulleys are not designed to exceed 400 horsepower or 6,000 RPM. Using reproduction pulleys on engines in excess of these limits my result in catastrophic disintegration of the pulley causing severe damage to the engine, cooling system and body damage. Neither Eckler's Automotive Inc nor Classic Headquarters assumes any liability for damages caused by improper usage of pulleys. Please be sure to install the pulley properly to avoid damages that could occur from improper installation or exceeding recommended RPM limitations.