yea the pistons with domes subtract from the chamber while the
dish adds, if high compression is needed its best to get small chambers
with least piston dome to get a high compression and if the
chambers are too small the dish will help enlarge the chamber,
all that stuff is interesting, long rods, short rods, with pins going
thru the oil ring or a long piston for a short rod, interesting
and then the cam with valves springs, man when you have the
tools you can put some mean heads together, when sizing the
cam, get recommened springs, its just hot rodding, good luck :wink: