Yeah the air ducts seem to be the way to cool things.
Man if I had one of those Bridgeport milling machines I could have saved a lot of $$ while building my engine.
A far as truck brakes, I've had my 86 F250 for 25 years and 300,000 miles. still have the original rotors. While going down a mountain pass with my sawmill behind, I got the brakes so hot the grease started to melt out of the bearings. The rotors are still good. although my heart is a bit weaker.