17.5 fan and shroud upgrade
fiesta, did you ever resolve the issue of sealing the shroud to the upper and lower tanks, and if so, what kind of material did you use? I am pretty much in the same boat as you, as I'm running a 17.5" (6 blade) fan in a 20" shroud opening with a 3 core aluminum radiator on a 455 in a '66 Lemans. My setup looks like a mirror image (except the aluminum) of yours, with basically the same gaps in the shroud. I would like to seal the perimeter of the shroud to the radiator, but am not sure how to go about it, or what material to use. Also, did you find the fan you were looking for? (If the opening is 20", could you use a 19.5" fan, or would you have to use a 19"? 6 blade or 7?).