A 3-groove water pump pulley (GM part number 3889372 (1968-70) or 3992071 (1971-74), no longer available from GM) is required for proper installation of this bracket kit. If your vehicle is not equipped with this pulley, you will need to obtain the correct pulley prior to installing this kit.
The following pulleys are available from Vintage Air:
Part Number: 735002
3-Groove Water Pump Pulley, 5/8” Pilot, 1 ¾” Bolt Circle Fits: 1968-70 427-454 Corvette Engines with Factory Air
Part Number: 735003
3-Groove Water Pump Pulley, 3/4” Pilot, 2 ⅛” Bolt Circle Fits: 1971-74 427-454 Corvette Engines with Factory Air
146035 - 1968-74 Corvette Big Block Compressor Bracket Kit
This kit Is designed to fit 1968-74 Chevrolet Corvette Big Block engines with factory air and a 3-Groove water pump pulley.
If your vehicle does not match these criteria, modifications may be required for this kit to fit properly.