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I do know one NHRA class racer that uses the front "chin spoilers" and not the rear trunk lid spoiler on his T/A to set a record that stood for the most time allowed, no one else could or would set it lower. He is known to do a lot of testing and doesn't leave anything on the car that deosn't work



There's a 69 Car Life magazine spoiler test that backs up what he is doing. For the time it was pretty sophisticated testing stuff. They used guide wire strung onto the suspension with a plotter in the car. Pretty well thought out test for a magazine.

They tested a 69 Camaro, 69 Javelin, 69 GTO. The Camaro outline would most simulate a sedan profile of an E-body, Dart, non-charger 66-70 B-body...

Well without any spoilers the Camaro's front end lifted at about 70 mph and the rear had some downforce about at 80mph. With just a rear spoiler, the rear went down starting at about 60 mph, but that also lifted the front sooner and even more than without any spoilers.

With the front spoiler only the front went down starting about at 60 mph, but the rear had some downforce starting at 70mph (little sooner than with no spoilers).

With the front and rear spoilers, the front lifted because of the rear downforce above 70 mph.

They concluded the best bet was front spoiler only.