Carb CFM recommendations

yellow rose said
Do NOT get caught up in the CFM numbers. The carb will flow the air the engine needs. With the adjustable air valve on the secondaries you can tune that up.

Again, like many things carb related, the math to calculate CFM usage is at best, silly. It's really pretty much worthless. It doesn't take into account what I said above, and it also doesn't account for pumping losses and things like that.

Drop the 650 on there and work on your tune up. Ignore the math.

In fact, my carb is considerably larger CFM rating wise than the math calls for. Think about tunnel rams with dual carbs.

Yeah, I see what you are saying. I understand the math is sketchy to a point. But overcarbed is overcarbed. I bult many small blocks back in the 80s and they all ran at their best with carbs well under 700 cfm. I had a 327 in a Chevelle with 202 heads that put out almost 350hp with a Carter Comp AFB 625 and it ran really strong. Not saying you are wrong. You make some good points. Just hard to kill old habits. And I have seen so many people flood cars with oversized carbs.