Individual header tube temp. Egt. Varies

BigBlockMopar said

One propane carb (Impco 425) mounted on a 4-bbl Holley-like baseplate.
The Propane is vaporised outside the engine in a vaporiser.

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OK, that would give a wonderfully uniform fuel-air mix, all in one big throat, not 2-4 of them. Something I had never thought of....

So apples and oranges in that way, when compared to a multi-throat carb.