Up for sale is this original GM water pump pulley 3995631AO. From what I can find, it is supposed to be correct for 71-78 Chevy small & big block; Impala, Chevelle, Nova, Corvette , etc. (please verify) Measures 6-3/16 exactly. This is for the long style water pump.This has been bead blasted and is rust free with NO pock marking. Perfect for a high quality restoration project.71 72 73 74 75 76 77 78 Chevy Impala Belair Biscayne Caprice Corvette Nova pickup truck C10 Chevelle El Camino SS Supersport Corvette Laguna Malibu Classic Monte Carlo water pump pulley 307 305 350 small block big block 396 402 427 454 GM 3995631AO
