If you are running an electric fan that is attached directly to the radiator, and the gap between the blades and the fan is less than 3/4", I doubt that the shroud will do anything, unless you also have another fan mounted at the end of the shroud. Just my opinion though. My Permacool fan said to leave the shroud off. It is mounted with about 1/2" gap from the rad.
383, TH200-4R, 3.73s
11.683 @ 114.70 MPH 1.580 60'
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