Manifold heat cross over physics and benifits

I'm not sure how relevant that movie really is. One point, is that engines such as many conventional sixes, slants, Fords, Chevies, etc, manifold heat is a real need because the intake is "out in the breeze," not heated by being cuddled in the middle of the engine, splashed on the bottom by hot oil, and in many, with coolant through part of the thing.

Many sixes with headers don't run all that well in fairly warm weather, as the carb heat is removed, and I can still remember the VW? Corvair? dune buggy with ICE on the bottom of the manifold on a fairly warm day!!!