Reply To: exhaust manifold advise

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Gary,

If the heat riser is your only concern, don’t worry about it. The manifold heat system which included a hot spot was used to heat the old gas which was not anywhere as volatile as what we use today. Exhaust manifold preheat is now a contributor to vapor lock problems and we routinely block the preheat passages in order to keep the carburetor a cool as possible. I assume that you have the late 29/ manifold which was continued into 1930. On my ’29 I’ve installed an aluminum plate between the two manifolds to stop the hot air movement around the intake manifold.

Good luck.

Bill