Thanks its been using about a gallon a week for a couple years but still ran strong.Last week it started knocking.Im taking the motor out now.Thanks for the infoNo sleeves. You can either bore it oversize, or get someone to press a sleeve in and bore it back to standard. I would sleeve it and bore it back to std to avoid the cost of new pistons. Figure $500-$600 for the bore and sleeve if it needs all the cylinders done...