The TFC exaust port stuffers made alot of difference. I know he raised the roof .100 He would not let me post the flow chart or pictures on the internet, got real wierd about it. He figures he knows something others have not figured out yet. He said he would want three grand for just the port work to do another set. The hp was still climbing and never fell off as high as we twisted it. He said that was a sigh that the heads were to big. I figured that's just a Cleveland for ya.