Belt Drive Pulley Set for BBC Big Block Chevy Gilmer 396 427 454 Engines Billet Aluminum 17493572Description: Type: Belt Drive Pulley Kit Fitment: For Big Block Chevy 396 427 454 Engines Material: High Grade Billet Aluminum Belt Style: Gilmer Belt Width: 1 1 2" Water Pump Style: Long or Short Water Pumps with up to a 5 8" Shaft The cogged 1 1 2" wide "Gilmer" style belt prevents slippage. The water pump and crankshaft pulleys have a 1: 1 ratio. Must be used with the factory alternator position, the alternator pulley has outside lips to help keep