it basically is a brand new engine. I had some problems with the 1st set of piston they sent me. They were way to tight in the engine, are mechanic said they should loosen up but two turned sideways and scratched the cylinders up so I also had to have it bored out to get rid of the scratches.
so mines bored I think .30 over. The only thing that wasn't rebuildt or replaced was the heads, intake, lifters and pushrods. The engine was in great condition when I got(found it in the back of my schools auto shop got it for FREE), it had two bent connecting rods from a failed gasket near the front of the engine. I read it was common for 1997 4.2, so we replaced the broken parts, and got a rebuild kit.