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Originally Posted by tamanaco
What more power out of my 670 cfm street avenger holley carbed 345 HP 302 crate. My speed shop said I'm under carbed, he is recommending a 850 cfm Proform carb...it seems like it my be too big? Any carb experts in the club?
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As a fellow Ohioan, I hate to think there is a speed shop that is this incompetent. Whoever told you this hasn't a clue. Never go back there. At 8000 RPM and 600 hp, you still would only need about 700 CFM.
Putting a bigger carburetor on an engine rarely makes more HP, as most engines are already over carbed. The carburetor doesn't force more fuel/air into the engine. The engine has to pull more air through the carburetor. Until the carburetor becomes the bottleneck, putting a larger sized carburetor on will do nothing for power, other than kill low rpm drive-ability. You're not even pulling 600 CFM into your engine (likely 500 CFM range).