Does anyone know where I can find the airflow specs for SBC heads by casting numbers? What I need is a comparison to a 416 or 450 casting head to put into Desktop Dyno 2000. The flow files that I have for desktop dyno 2000 are castings 462,882, 441, 041, and 186. I am exchanging the heads that I bought from AM Performance Heads from 58cc to a 64cc for my rebuilt 283 that is now a 327.

Sean, goto chevyhiperformance.com and then into the tech articles. The flow numbers are list in an article about heads.

http://chevyhiperformance.com/techarticles/41598/