There is a chart where you measure the butterfly bores then follow the formula on this page: http://buickperformance.com/carter.htm . It's a Buick site but perhaps the formula is the same for all Carters? Gary H. -----Original Message----- >I found an old Carter AFB this weekend. Its a stamped G7 3859SA 37. While asking on a forum I found its for a Chrysler 8 cylinder 1962-65 383,413,440. > >Anyone know what CFM this would be?Dustin65 Barracuda ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.