the gain would be to get rid of the grill openings. I think there are better ways to get around this, especially when the goal is hyper-milling, but if it were to be done I wouldn't make the hood hold the entire amount of coolant, but I would install a higher flow water pump to move the water faster. I'm gonna break out my heat transfer book and see what kind of cooling is achievable from a hood and under the car for kicks.
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