I didn't realize they had two different rads in them. Never looked at my 1572 and 1772 while comparing them side by side. Learn something new everyday. I do know they added the fan shroud extension to aid in cooling to some of the 1572's. My 1572 has it. I've seen them without it as well. Boy Frank, I can't think of any way to increase cooling capacity without putting in a larger radiator, which as you stated, would be impossible to find from a donor 1772. Curious to see what others think. Now I'm gonna have to go out and look at the supers and compare rads........
