Has anyone put a big bore kit in a 660? I recently purchased a '01 660 and during the replacement of 2nd gear I had the cylinder measured and noticed it was getting egg shaped, so I bored it out. I went right underneath the Big Bore with a 110mm Piston. My question really consist about having nothing but problems ever since. Motor doesn't seem to want to turn over most of the time, and if it does, it drags. I have even more recently crack the cylinder jug, and pulled the threads of the front left ear of the jug. So I am currently getting it welded back together and going to put time inserts in the block to re-enforce the strength of the jug to the bottom end, but I am also curious if there is something else I should do to re-enforce, so that I am not cracking heads and jug's all the time. Should I jet it? Should I advance the timing? If someone out there could help me, that would be great. Thanks in advance.