on a g&z 049 if the deck height is .118 after break in what  should the height be when fitting a new piston? all help is appreciated.

I am not sure I understand the question exactly, but are you asking what deck height you would measure if you slip the lapped (but unrun) piston into the cylinder---and if you had lapped it "just right"?

I think that is a tough question except for a real engine man! (which I am not --for sure!). I am pretty sure it would be a little more than 0.118 so that running the engine would bring it the rest of the way in.

I am also not familiar with that engine (although that wouldn't help me anyway), but maybe include a few more details, like is it an ABC setup, or an iron piston/cylinder. Maybe someone else would have an idea.

let me try to clear up my need.factory heads have .006 or .007 cleaence without shims at .118 top of liner to top of piston. i have 2 engines turning 34k with this setup. what I am trying to do is sneak up while running in. without wasting too many pistons I need a quesstimeate starting point. I have made my own heads with above clearence[.006] but timing changes and I can not get over 32k. I was hoping someone has had similiar problems. again I appreciate any help.