Okay, i just scoured google for a while and i can't find a pic of what I'm talking about.
Maybe it wasn't a corvette, but some other american muscle.
Many cars have an air dam just behind the front face of the bumper. In the design that I'm refering to, the center section of the airdam is set further back - it has been pushed back to the radiator and has an open top. So air going under the bumper near the middle will go between the side portions of the air dam and strike the center portion, where it is then pushed upwards to the radiator.
If you looked at the nose of the car from below, the airdam would be shaped like this:
-------_______------- where "up" is the front of the car.
I'm sorry for my textual description abilities...
