Ok, Great!! I thought for a minute you coming over to the "dark side" (lower CR). With a -16.7cc disc I can say that I have a reverse (up side down) HEMI LOL!! I appreciate all the help and research. 4.180" dia. gasket...that a pretty big hole over the piston. Won't the dead space create an area for pre-detonation or pre-ignition??? Or should I not worry about it?? As for the heads, I haven't had time to check the actual CCs on them. I have the equipment for CCing but just haven't had time. According to the Small Block Mopar Engines book they should be between 66-72.5 CCs.