Yes they will get too thin, id have to check my piston size book. I know a common adaptation is bore small end to 20 mm and use Mazda pistons for a little more compressionis there plenty of metal in the sleeve to bore? are they ever too thin?
Just whatever will provide a good seal and maximum life is good for me. I do not need extra power, I am going to put the 4.24 trail creeper gears in the transfer case which will give me all the torque I could ever ask for. Thanks for the info... There will soon be snow here, so it is a project for the spring..There is enough metal in the sleeve to bore to what I would call the "normal" over sizes which would be 1.0 or 2.0 mm over - if you're attempting to bore over that to fit pistons from a different engine, then yes, it is possible to bore too thin, I would suggest you consult your machine shop buddy on what is too thin.