Manifold heat cross over physics and benifits

I think it depends to a certain extent upon the engine

Mopar/ Chev/ Ford small blocks have a "natural" heat, at least once the engine is warm, because the bottom of the intake is heated by oil splash, and probably "some" heating from the front coolant passage.

But slants, after being converted to headers, have NO heat, especially "way out there" on the end of the manifold, and B/ RB type designs, with elevated manifolds, don't get as much, either.

It also is going to depend on your local climate.

But you must know that it's not JUST the "heat," it's the COOLING. A carburetor is really, a type of refrigeration unit. the fuel and low pressure in the venturies cause a cooling effect. I once saw (forgotten) either a VW or Corvair dune buggy with an aftermarket tube manifold and Holley 2 BBL. In 90* heat, it was generating ICE on the outside of the manifold tubes

I believe what you are hinting at is the "answer," though, and that would be having "some way" of shutting the heat OFF or throttling the heat "down" when warm.

I'm considering (small block) experimenting with the Ford type coolant "heated" carb base. Turns out the Ferd ones are not all that adaptable because of the casting of the device. I've acquired a couple of 'em, but both need some work.

Really, the "stop gap" has become by default, using various thicknesses of insulator gaskets under the carb.