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Lets say that there is a Ford pulley the same dia as a single groove stock. It also has the same groove spacing for alt and ps. Some used this pulley for ac or onboard air. My Bronco had a cast iron pulley which was the same as above but weighed about 3 times as much.
Just what the doctor ordered! I am interested in the 3 groove pulley. What's the odds they use the same width belt? I will have to do some measurements. I have aftermarket AC and Alt.
I bought mine off EBAY It is cast iron 3 groove 3 bolt I thought it was and older 302 but I needed it for my power steering set up..and ac set up later ..