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When it hits 100 degrees, that extra quart of water, and the extra open air surface amounts to a lot of extra cooling. Open up the rad surround and mount up that 26" rad, or stuff a thick aluminum rad in the 22" opening. Gene

Well it dam gets 100 hear. Don't want to cut my core support, so looking at Mark 7 rads, alum, large tubes & offers black anodize. Thanks Mark