Originally Posted by Bobsw32

Outside air is cooler than under hood air while ram air creates high pressure much like a supercharger..... Now for a quick story....Many years ago I installed a 1970 ram air hood on my 1970 convertible. I was running a high rise intake so I did not use the ram air air cleaner..... I immediately began experiencing over heating with the car at speed (60 Miles per hour)... It would cruise around town all day in 90 degree heat and never overheat........After replacing everything in the cooling system an old timer said just block off the ram air hood and see what happens.......It turns out the ram air hood created sooo much pressure in the engine compartment the air could not get through the radiator..... Lesson learned THOSE HOODS WORK!

Originally Posted by GMMechanic

Bullshit story. The engine compartment is not air-tight, and any air from the scoops would be able to exit under the car. So there would be no "sooo much pressure in the engine compartment the air could not get through the radiator". Come on, people.

Originally Posted by Run to Rund

In 66, the air intake "bezels" in cooling slots in the bumper fed the "ducts" behind the bumper. Not under the bumper until 68. The 66 factory W30s window stickers called it Force-Air Induction, and GMPD used O.A.I. or outside air induction. The six-page instruction sheets in 66 called it Outside Air Induction system. The Olds letter (June 3, 1966) from G. A. Hirshman, Asst Admin. Engineer to W. E. Dismuke of NHRA began: "Oldsmobile has released an induction forced air system for its 1966 4-4-2 models (W30 option)." the letter then went on to describe engine, induction, battery, and rear axle changes pertinent to the W30 option. As noted above in this thread, Olds did not use the "ram air" term. Olds also did not use the Pontiac "Tri-power" term, rather "Tri-Carbs" was used for the three two-barrel carb option in 66.