Jay. I do not know what to tell you. Indeed, the 65 slant 6 Dodge I have was a single pulley, but as I look at Ulf's pics, I see his is a double pulley. 65 Dartman suggested that the double pulley, possibly, was factory; whereas, the single pulley may have been dealer installed. Your 66 has factory air with a single pulley, so between Plymouth and Dodge may have been a change in what they put in them. Was Dodge a cheaper version than the Plymouth or vice/versa? Interesting. Examining these old cars and what they did to construct them brings up some questions to be answered I guess. I appreciate your help. Jerry
