Some time ago, I posted venturii area for Carter WCFB carburetors. Since then, I have searched the Carter documentation in my possession to do the same for genuine Carter AFB carbs. The focus of this article is ONLY on genuine Carter AFB carbs; the modern imitations are not considered regardless of if they are marked Federal Mogul / Webber / Edelbrock / or even Carter. Yes, Federal Mogul tried to market some that were marked Carter, but Carter distributors refused to sell the watered-down versions! If you like the imitations, fine; but I will not even attempt to research them. I have totally given up on trying to place a formatted article here, and the site would time out if I attempted to type an article of this length. Thus, I have placed the article on my website with a link: https://www.thecarburetorshop.com/AFB_flow_ratings.htm Comments are welcome. I triple-checked my data, but even so, with this much data, there is probably at least one error somewhere. I have no ego. If one finds an error that can be documented, I will be more than happy to correct the article. This will be the last of these articles on Carter 4-barrels. Virtually all of the O/T thermoquads have published data, as do the equally O/T AVS units. Jon.