Well i have the bimotion head program. I know jts just the guy who made its opinion on what is what. I didnt think about the inconsistent radius of the whole dome of the piston. It just asks in the program a piston height. By using the bore of the of the piston and the height of the dome in a spherical cap volume calculator It seems to be around 18cc. Adding that to the dome I was playing around with it adds up to be the dome cc uninstalled would be  a 57cc dome. And 14.2 CR.