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I may be able to answer that one.
Cowl induction was a Chevy thing and it was found on the Chevelle in the late 60's and early 70's. Most traditional hood scoops pull air in from the front in sort of a ram induction style. Some engineer found out that the air at the windshield is cooler so a hood was developed that pulled air from the back of the hood by the glass. It was a small flap that was vaccum controlled and as the carburator created more suction the flap would open and pull more air into the breather.
I had a 1970 El Camino with a 327 that had this hood on it and i always enjoyed flooring the eccelerator and watching that flap open up. One thing i do know for sure is that i did not lose many races.
Since we have discussed this let me say that you will see some cars at the shows and the badge on the hood will say Cowl Induction but if it don't have that flap right in the top of the hood towards the back of the hood it aint the real thing.
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