For your comments and Jay's follow-up too.
It's apparent (and sad too) that the carb 'modifiers' and Holley are both at fault for literally advertising flow rates of 900-1,000 cfm from carbs that can't even come close to that rating. This has bothered me for some years since I could not understand how in the world even a 850 cfm based carb could be worked-over enough to flow an additional 150+ cfm! Yes, a few percentage points more due to thinned throttle shafts and plates, re-shaping of the upper venturi area, etc. But that much more?
http://www.holley.com/data/Products/Technical/199R10016-2.pdf
Now we know! Frankly, I am now amazed that someone hasn't literally sued these folks for false advertising....and I'm not kidding as many if not most actually do state "our carb flows xxx cfm"! Now, perhaps some heavily modified 750's do flow 830 cfm and some 850's up to say 900 cfm. But, the point is many do make unsubstantiated claims that lead us, the unwashed masses (!) to purchase what we assume to be a carb capable of flowing more cfm (like a lot more!) than a std. carb.
Guess we'll need to rely even more so in the future on dyno or track testing just to be sure.
