cold air induction L88 hood

[ChrisS]

I remember reading some time ago that for every 10 degree drop in ambient temperature entering the carb there is generally a gain of approximately one percent in horsepower. I'm not sure what the baseline temperature would be and at some lower temperature it seems there would be a point diminishing return. Has anyone else heard of this?
I also remember that GM had built the first wind tunnel for aerodynamic testing among the U.S. automakers which led to the development of what I think would be the first cold air, cowl inducted, hood used on the '67 L-88 Corvette.