Im really not sure what the machine shop did. This motor has been a mess from the get go. i dropped the block, crank, rods, pistons off to be balanced, pistons pressed on (yeah should have got bushed rods), block hot tanked, cam brg, freeze plugs, mag, bore, cnc square n deck...the norm. The pistons are wiseco forged .125" dome 4cc that are .015 taller on pin height than a std 350 piston. 5.7 eagle rods... Well when i dropped it off I told them I wanted it Zero decked and that the pistons were taller than std. they called to confirm a week later that 9.015" was what i wanted it decked to and I agreed since it was going to be cnc squared off the mains after line bore/hone. Well Idk what their issues is but I picked it up and they decked it to 9.000....So after running .051 head gaskets and tearing it down, I have witness marks on the combusion side of the pistons. Heads are dart pro 1s with the fast burn chamber so there is a portion of the combustion chamber thats closed in on the opposite side of the quench. Piston rock when its cold is causing this tight tolerance issue and Im just tired of this block all together. Not to mention when they plate honed it they stripped out a head bolt hole and freaking heli coiled it. I called them out on it all and they pretty much said "sorry bout your luck and dont come back"...typical dirt track machinist mentality. If I was a local they may have done something about it. Lesson learned.