Hay, I apologize John, didn't answer your real question. I don't know of another GM fan that is larger in diameter. They used another 7 blade in that era which is a little different design in the blades but also a good fan. Pretty sure it is the same diameter as the 772 though. I'll try to find the number and diameter and let you know.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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