- Superior Reproduction From Classic Headquarters
- Heavy Gauge Stamped Steel
- Triple Grooves
- Correct Part Number & Inspection Stampings
- Replaces original GM Part # 3937787
- Excellent for use with our Vintage Air kits to give you the third groove for the compressor too!
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 Midnight Oil 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.
Also Fits: 69-75Nova, Chevelle, El Camino, Impala, Bel Air, Biscayne & Caprice Big Block 396 & 427 with AC