I have a street Dart , 446, hughes solid cam 250 dur at 50 575 lift ,worked Stealth Al heads ,single plane intake ect.... 230 miles on rebuilt engine , Engines a dog , noticed my pistons are .120" below deck and my compression is pretty low . 130 psi average . I told machine shop I wanted as close to 0 deck as possible( 10.5 0 or 11.0 to 1) but I was busy working and I let the machine shop put it together. I usually assemble everything myself and check all clearances, plasti gage ect... and take my time because its my money and its fun. The owner of the machine shop passed away and shop was sold Otherwise i would take the engine back to them and work it out Situation I want to change my pistons to a KB 237,s , I calculate that I should be much closer to 0 deck . I haven't sat down with a sharp pencil to figure everything out exactly yet Question With 250 miles on a fresh engine can I simply just change the pistons . Street car and not a race car Do I have to take everything re balanced again ?