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So by blasting hot air into the primaries, you are heating not only the carb, but the air in the manifold, and most likely the combustion chamber too, so Ryland's comments above are correct.
But this leads me to another idea. Why not install a 12V intake heater much like many diesel engines have? Many have a +grid heater right in the intake manifold or close by to pre-heat intake air before you start them up. They also continue to heat for a little while after startup. They are high capacity heaters, using 60 amps or so. I am thinking that maybe a small one in the airbox, pre-carb, would work well.
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