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3 grooves on the crank. the 1 closest to the block is for the alternator, #2 is for the air conditioner, #3 is for the Power steering. 2 grooves on the water pump are for the alternator and the air conditioner. I will see if I have an old picture of my '72 setup.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper
72 bug(the better half's) under reconstruction
2009 HHR aqua blue
71 GMC k20 350/sm465
2009 Chevy hd3500 6.6 Victory Red crew cab dually
Dave & Jeanne
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