273 302 318 340 build

The chamber looks pretty rough, have you measured the others to see if you get the same number? Also piston height on the other ends? Have had deck heights differ. I want to help but I have no experience using dome pistons with a open chamber and don't want to lead you astray.
A little info from UEM: http://www.strokerengine.com/KBengineTech.html
"A running quench height in excess of .060" will forfeit the benefits of the quench head design"