Carb CFM.. Increase?

Okay maybe it is crazy. If it is though I am not in the minority for having an understanding that it is not. It is the only way I have ever heard/read about a carburetor being chosen. I am willing to concede it may well be wrong but it is certainly the common practice of selecting a carb.

I suspect the proform 650 can likely flow some more because I know they have made some improvements and it is a race carb but it is still based on 650cfm at 1.5hg I would assume.

David Vizard has a good write up on selecting a carb size. It is based on the old formula that everyone knows but he puts a modifier onto it based on your heads and camshaft duration @050.

Techtips - How to Select the Perfect Holley Carburetor for Your Car

Now if my 650 can flow a lot more then what it is rated at though then I think that is great to hear.