Been working on moving the shroud back using some 3/4" aluminum angle for top and bottom and U channel for sides. Got everything done except the bottom, that will be for tomorrow. Everything has to be polished before installing, a little time consuming. Hope to test it out tomorrow when completed. Now have a full 1" between core and shroud. Hope it works. The fans were supplied by the radiator builder, he claims they are the best out there from his experience. Some guy builds them out of his garage somewhere in one of the Midwest states. The shroud has rubber flaps in bottom for high speed flow, same as used on the BeCool shrouds.