That's been my experience as well- - - -to get any measurable increase in either power, torque, or RPM, it's necessary to flow more air. Back in my "claimer" racing days, the way engine cost was kept under control was to limit us to a Holley #7448 2-barrel carburetor- - - - flow rated at 350 CFM! It was pointless to get radical with cylinder heads, camshafts, intake and exhaust manifolds, etc. it the carb couldn't flow enough air to benefit from all that expensive go fast stuff. Of course, we got creative abut bending the rules. Flat washers between the carb and the intake manifold to suck air downstream of the venturi was one trick, but the tech inspectors learned to get suspicious of an engine that wouldn't idle. I had a lot more creative tricks up my sleeve that they had to work a lot harder to find. Like Smokey Yunick was fond of saying- - - - -"It ain't cheatin' if ya don't get caught!"
LOL!
Jerry
