Thanks for the info. Looks like what I have right now is a water pump pulley for a 69 & earlier AC car. I can work with that, although the larger diameter pulley MIGHT be better. I always had problems cooling the 273 in my car but I think that'll be taken care of by the time I put in the 408 as I'm putting in a bigger radiator & adding a shroud. Anybody have a 69 & earlier single groove crank pulley they want to get rid of? I've got a 3 groove I could use but it's more than I need & I think I've also got a new Bouchillon Performance single groove 70 & later water pump pulley I don't think I'll be needing.
