Re: pulley part #s
You're right Rick,there is a revision noted for those vehicles built w/AC after 6/3/70,which coincides around the time this pulley was first produced.
It looks like this pulley was as a replacement part on late 1969 Big Block & Small Block Hydra lifter vehicles WITH A/C as well as original equipment from LATE production 1970 through 1976 vehicles with same.
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