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Watching these videos will help to get you up to speed on Strombergs. I think there are four from Charlie on the tube. Float setting is critical, fuel pressure is critical and vacuum a must have. Not uncommon to see these old carbs leak vacuum from poor or improperly installed bushings. And then there is the issue of the gas that we use that left to set will really crud up the emulsion tubes.
If that engine has a big cam you are going to have a bitch of a time getting enough vacuum to run 6 carbs. Is the manifold home made or after market?
Post up some pics of the carbs, the bases and that intake.
Kool looking ride.
