Rough idle on 1951 8BA

[51shoeboxer]

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Originally Posted by Steve51

Leaking power valve in the carb base or poor mating surface in the power valve chamber where the carb sits on the base causing a vaccum leak. Some of the new valves don't seat properly without a slight modification.

I think you are right. I saw a video that demonstrates how the gasket under the power valve might get hooked on a ledge on the power valve and cause a vacuum leak. I couldn't check for that, but with the engine running, I shot some carburetor cleaner on the gasket for the power valve chamber and on the vacuum connectios on the carburetor and the vacuum chamber; and saw no difference in the idle quality. I guess I'll have to pull the carburetor apart.