Re: pulley part #s
I believe WaterPump pulley #3995631 AO is for 1971-75 Small Blocks w/61 Amp Alt,..not possible on a Solid lifter SB,and 1973-74 ALL w/454 CID.
Crank Pulley #3751232 BB is for nearly Every Small Block 1965-68 Corvettes(w/AC)-Trucks-Passenger w/Hydra lifter 283 & 327 & 350 CID w/P/S,and 1964-68 Chevelle-Chevy II-Camaro w/Hydra lifter 283 & 327 & 350 CID w/P/S but w/o AC...and 1975-77 Monza 262 w/o AC.
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