New Magnum heads for 347 with Flow data

Best down to earth info,seen in a damn long time(on Magnums). Thank you ,Ramm. FWIW,what is the intake runner cc out to. I have heard of smaller than stock Magnum 153 c.c. replacements?...

Thankyou A-Body Bomber. I think those with some real world experience will appreciate this info. There will be no "fluff" as "fluff" does not serve anyone. I will cc the runner in a bit and post that as well. They do appear awfully small. This wold be why velocity at the apex of S.S. was over 400 f.p.s.! J.Rob