Thanks for clarification into the theory of that. Yessir, a larger drive will move a belt faster. I'm in the Tampa area, and don't have overheating issues on my 340, w 4:10s. It was in a much heavier car ( 66 sat) in a Duster now. I could measure, if it will help anyone. All the pulleys are of the original 66 273 a/c mill that was in my old Satilite
