Sorry to chime in on your post, but I have a related question, I having a motor put together and was going to run a .646 lift cam with in. Duration (.050) 258 ex duration (.050) 270 and a 110 lobe seperation, it will be wet exhaust but imcos with the "s" riser so the water will dump in pretty far back and below the exhaust ports height wise, do you think I will have any reversion issues?