.Going to replace the 216 in my 3600, 53 pu. with a 54', 235. The motor was frozen,{ got it apart. one cilender was (cruded up).Looks like,it was on the bottom of a river.? is what would I be looking at for 1.reboring, 2shaft also?.......Thanks Paul,PS this is my first time, my brother is doing all the work,I run for tools,(Baby brother, guess he's finaly getting even?)