Reply to "Radiator & front condenser clearance"

Angelo, I can't say definitely on the pusher shroud restriction, but I ran a dual 10" sucker fan shroud several years ago, and around town and at reasonable speeds they worked fine to keep the engine cool. On my favorite NV test road, ten minutes at a steady 140 mph saw the water temp gradually climb from 190F to 230F. Slowing down to 90 or so, the temp also slowly came back down.
A few years later with 12" sucker fans in a matching shroud, a repeat of the same road & speed showed no temp increase over a ten minute run. So I suggest that you run the largest possible fans in your sucker shroud. If that's not economically possible, cut the triangular areas between the smaller fans and cover the cut holes with flexible rubber flaps held only on on edge. The theory is, at very high speeds fwd air pressure thru the rad will push the flaps open, reducing any restriction due to the shroud or fan size. Then at low speeds, the suction of the fans will keep the flaps closed, improving shroud efficiency. Look at certain stock Honda and watercooled VW radiators from the '80s-up which use this flap principal to good effect.