I was thinking of the same thing...watching Trucks this weekend and they put a fiberglass cowl induction hood on a Chevy truck with a vacuum actuated flap that popped up during acceleration. Same thing was on the original SS Chevelle's '70-'72. This one had a channel on the bottom side of the hood that went over to the intake area and provided it with the cold air off the windshield (cowl area). When it opens it draws air from the back side not the front so rain would not be a real issue, but you could put a manual shut off valve in the vacuum line if you like. This could be possibly be done on the stock hood if the clearance is enough...but would definitely be possible if the hood swelled up in the center kind of like the old cowl induction hoods available for Mustangs.
Definitely worth looking into.
Scott
2002 F150 SuperCrew
