You said "Just the dome of the piston" So then I thought you ment domed pistons not flat tops or dished. So I thought maybe you ment the highth from the rist pin to the top of the piston on any piston wether domed or dished. I want a lower compresion from a flat top or dished. So what was it that you asked originally.
I guess I dont know what you me I am not trying to be smart just trying to awnser all the questions I can to get the answer.