Quote:
Originally Posted by mmzullo
Good luck in finding the correct double pulley for the drive. I have 4 hydro set ups. 1 for the original but have yet to find the correct drive pulley. The large pulley is smaller then the later year hydro units as someone has stated. I think it's 1 inch smaller is diameter. I was going to get it machined but never did.
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Well, one of the pulleys(see pic) on one of my O's has 4 holes already tapped for bolts. I'm going to just bolt on another pulley, and from my investigation, the pulley to drive the hydro unit is the same size as the drive pulley. At least the 71's aux. pulley is the same size as the O's drive pulley from what I can see. I'm still on the fence about it, but I'm leanin towards doing it.