Quote:
Originally Posted by Drbrown
Regarding concern about valves, attach a vacuum meter at you carb. If the indicator needle stumbles, jumps etc it could indicate a sticky or badly seated valve. This is not unusual for engines that don't get enough use. If so, next step might be to add some MMO .... a bit down the carb and a quart in the oil. At purchase my '47 had same symptom and the MMO cleared it up.
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I had a vacuum gauge on my engine, it fluttered a little bit, I did run some Seafoam through it, no change. It is not one valve that is a problem, it stumbles on all cylinders intermittently. I am going to do the MMO however.