Slightly strange head flow question.

But in this case you already have an assembled engine, and Every engine has a maximum cfm it would be capable to make use of?

I agree,the engine is a complicated thing, but thanx to pros sharing ideas and mathematic, we need fewer tries today to make maximum power of a spesific camshaft than before...

To make maximum power, the combo has to be perfect. Pipemax show you the ideal line, and if you put in your engine , you may compare and find out if it will make more power with more cfm.