Check with Jim LaRoy (IQ52). He has some serious ported iron heads 300+ CFM.
Quote from "forbbodiesonly.com":
http://www.forbbodiesonly.com/moparforum/threads/flow-chart-906-heads.120185/#post-910540502"These are different stages of port design we have done with the 906 head depending upon the effort extended. Some of these take weeks to do. It's why I recommend aluminum heads unless iron is required by the rules or for some personal reason you just must run iron. None of these have required welding or epoxy. We haven't done an all-out 906 head for 8-10 years. All of these are from our records on our flowbench.
Lift... stock I/E
.100......63/57......89/60......80/61......91/.....71/.....91/.....89/60
.200....137/103...168/124...161/126...157/...150/...165/...161/129
.300....187/145...218/170...219/175...217/...209/...219/...212/185
.400....216/168...249/200...262/201...250/...257/...272/...257/216
.500....224/176...260/217...280/215...276/...292/...299/...297/234
.600....232/183...258/228...297/221...290/...313/...325/...331/253
.700.....NA/NA....258/236...297/224...297/...321/...335/...347/264
Below was in 2011 using and old set of 906 we had done years before. If you scroll down to the La Roy Engines account you will get a brief description of what these heads can do on an engine that was blown up the day before because Comp Cams forgot to turn the water into the block before firing and running the engine. We ran the engine the following day with water back in the engine and 906 cylinder heads. We had 15 bent valves and 56% leak down in one cylinder. Those heads will still hold water to this day even after getting so hot the paint began burning off the cylinder heads because of no water in them.
http://www.hotrod.com/articles/mopp-1203-the-amsoil-mopar-muscle-engine-challenge/http://image.hotrod.com/f/35960380+...ngine-challenge+laroy-engines-group-photo.jpg"
