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Winkosmosis - Yes, racing cars commonly vent a front-mounted radiator through a hood vent - check out a Ford GT40 or most any racing car. If you look at the flow diagrams here and there on EM you'll notice that most cars have a huge high-pressure area right at the nose, and a strong low-pressure area just aft of the leading edge of the hood. Put the intake in the high-pressure area and the outlet at the low-pressure area, and seal up that underbody!
The low pressure over the front of the car was more-or-less discovered by Bruce McLaren in the early 60's when he was testing a racing car. Someone hadn't fastened a flap and, to his surprise, rather than being held down by the airstream, the flap lifted more and more as speed increased.
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