Stop in for a cup of coffee

ScampMike said
How do I select the correct CFM carburetor for my application?
Answer: The carburetor CFM is a very critical choice in your build. Too large will cause low RPM issues and a rich condition. Too small will restrict the engine performance at high RPM. A simple formula is commonly used by our techs to select the proper CFM:

(Cubic inch of engine X Max RPM) / 3456 = maximum CFM required

Ex. (350ci X 6500RPM)/3456=658.28 CFM (a 650 CFM would be ideal for this application)

I get that part, but when a 340 engine is running 3 carbs for a total of 960cfm @ WOT, how does it function properly?? Now granted I dont know if all 3 carbs open together or not, but that is what Im trying to understand.. It doesnt make sense to me.