Water pump pulley for '72 AC car question
So, I have determined that as far as I can tell the PO of my car installed the AC brackets and belts and routed everything wrong, but I didn't realize it until mapping things out to prepare to pull the engine.
I was looking at the 1972 Chevelle Assembly manual. It shows that for a 1972 AC car, based on the belt routing, I should have a 3 groove crank pulley, 1 groove water pump pulley, 1 groove alternator pulley, 1 groove AC pulley, and 2 groove PS pump pulley. It shows that the alternator belt goes on the front most groove of the crank, around the water pump and around the alternator. The next belt is then supposed to be the middle groove of the crank pulley, goes around the crank and front groove of the PS pump only. The next belt is supposed to be the back groove of the crank pulley and go around the crank, rear groove of the PS pump and the AC compressor.
On my car currently the PO shimmed out with a spacer the AC compressor and has it using the belt on the middle crank groove and also going around the water pump and PS pump using a 2 groove water pump pulley, and the PS pump belt is on the rear groove of the crank. He also installed the front AC compressor bracket upside down and removed the rear AC compressor bracket. The alternator belt is in the right place.
My question is around the water pump pulley. If the assembly manual is correct, I should only have a single groove water pump pulley. But, I see a 2 groove water pump pulley called for with AC cars all over the place on websites and retailers. Why would that be? Anyone have any ideas here and maybe shed some light on what it really should be?
1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73