This part of the article is what I was referring to, in regards to 'ramming' air, John-
“The amount of pressurization produced by a hood scoop varies as a function of the square of the speed of the vehicle. The formula for calculating pressure is:
0.0000176 x air speed in mph² = ram pressure increase in pounds per square inch (psi).
“If you plug in the numbers, you’ll find an increase in inlet air pressure of .142 psi at 90 miles-per-hour. Standard atmospheric pressure is 14.7 psi, so this represents an increase of just under 1 percent. If the air/fuel ratio is adjusted to compensate for the increased pressure, there should be a corresponding 1-percent increase in horsepower. For a 1,200-horsepower Pro Stock engine, that’s a gain of 12 horsepower. Hood scoop pressurization increases dramatically at faster speeds: It’s 2 percent at approximately 130 miles-per-hour, and 3 percent at 158 miles-per-hour. At the magical 200 mile-per-hour mark, the theoretical pressure increase is .704 psi, or 4.8 percent. That equals 56 “free” horsepower."
Joe- retired geek
1963 1/2 Custom Hardtop
342 stroker, solid roller, T-10, 3.55 posi