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600 to 700 rpm. This is with a/c off.

 

Crank size? Do you mean crankshaft? And the word size has lots of meanings for that item.
Like length, counter weight diameter, weight, crank pin center distance , diameter of rod throws, diameter of main bearings, snout diameter, and lots of other dimensions I did not mention. So how are we to figure out what the question is?
And I suppose there maybe a belcrank or two found on these cars too.