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air pressure
To lower under hood temp I cut an eyebrow in the hood of my 65 Mustang 6-cylinder to allow heat to escape. Using wool tufts taped at the opening I found air did exit up to around 55 mph...then was sucked in. By that speed air-in or air-out did not matter. It did run cooler in traffic and had no effect on the highway. Looking close at the attached picture you can see the small eyebrow cut. The LH-6 on the hood showed I was PROUD it was not a V8. A cool-air intake, 2-bbl carb, hot ignition, bored .060", free-flowing exhaust, 2.83 rear axle, and 15" tires, made a good combo. With 4-speaker stereo and cold air it was comfy too. Maybe that is why I owned it 27 years.
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