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Glad I could help. There are variations amoung the 3 sheeve pulley's though. Back when I was rigging out my 331 in the Comet I was lookin for a single groove crank pulley and couldn't find one, I had a half dozen 3 sheeve pulleys, one was built in such away as it was a simple matter to put it on a lathe and cut a groove on the inside and remove the outer two sheeves. All the others were built differently so that you couldn't do that.