W/P Pulley
Bob, both of my 72 455HO a/c cars have the same 485397 YN as yours, and I believe they are correct. As Steve mentioned, the black car has the 80A alt with the idler pulley. I don't know if they used the same water pump pulley. I would think they would be the same. Maybe someone can look it up in an assembly manual or GM parts list to verify?
My non a/c 72 T/A has the much bigger 481039 XF pulley.
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