Frank-I have heard that .60 over is about all you want to go. I rebored my 235 to .40 over and had no problems getting the oversized pistons and rings. The 62 1/2 ton has been about 30K since rebuild with no problems. You get a little more power with the rebore but not a whole lot. I still have room for another rebuild if I live long enough to wear this engine out-which is doubtful..


Green Machine