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Basically a 2 barrel carburetor was developed for a V8 engine. It delivers fuel from 2 sides, each side for one row of cylinders. So you have single barrel carburetor only delivers one lot of fuel, 2 barrel delivers 2 lots of fuel to make distribution more even on V engines. You also have 4 barrel carburetors which deliver 4 lots of fuel for more even distribution and generally for better performance. When tuning a 2 barrel you can actually hear the difference if car has twin exhaust and you stand at the rear and listen as someone else tunes the carburetor.

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Q: What is a 2 bbl carb?
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