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First gen z cars (1969) had coolant heated manifolds and preheated air into the air cleaner, via a winter-summer flap on the air entrance snorkel to the air filter housing.
My 37 Ford's original intake manifold had a passageway and a port to the regular exhaust port that used exhaust gasses to heat up the manifold directly below the carburetor mounting point.
Nissan even had a heated screen in their last carbed 200SX's, using the NapsZ 2 liter engines.
Preheating the fuel with otherwise wasted exhaust heat energy is still being developed. Check out transonic combustion.
regards
mech
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