help with carb selection

http://www.summitracing.com/expertadvice/popup.aspx?Control=CFMCalculator

this was put to help you base your carb purchase in the future based on est max rpm for motor ...........

800 CFM. JB

350 spinning 5500 RPMs:

Street carb - 473.45 cfm
Race carb - 612.7

^^^ Very surprising.

I always figured that the CFM for the daily driver or family car would match the formula that's been around, but a high performance CFM figure would increase the response to carburetion as well as just airflow.

That formula in the link is a good rule of thumb. According to that, my 500 Caddy engine needs only 614 CFM to go get groceries, but 794 CFM if I'm in a hurry to get to the local watering hole.

Just saw this sticky and its on the money. I had a 780 holley then it started acting up so i borrowed an 850 and it picked up the car a bunch 13.66 to a 12.95 455 6100 trap rpm expert advise says Racing Carb CFM : 883.41