That sucks! I'm really glad I took it apart now. I found a guy at a diesel repair shop that is well known I guess for fixing cast iron. So well known that it will be atleast two weeks before I get it back! Soooooo I just bought a pair of heads that have been rebuilt not too long ago according to the seller. They came off of a 73 motor home 440. They won't flow even close to what I have now but for short notice and $50 for the pair what the hell. The nitrous will probably make up a little bit for the lack of flow. I want to put a good pair of head gaskets and arp studs. Any recommendations for head gaskets running nitrous?