1957 diameter of 12v generator pulley

[twstnshout]

What is the correct diameter generator pulley on the base horsepower 57 312?

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[biddle]

@twstnshout "1957 12volt generator pulley" does not summarize your post. Could mean anything including you want to buy that part. I am Updating your title now.

 

[RogerV]

It is difficult to measure on the car with parts in the way, but I came up with 3 1/4" OD. (Don't bet any big money though)