My 261 is a '62 model so it has the full-flow filter system with the big filter can. My engine has only 40,000 miles on it. It came from an activity bus , so the bus was only used for "special occasions". I stored it for several years after I got it. I had removed the sparkplugs and reinstalled them "finger tight" so I could put some lube in from time to time. I believe some kids helped me by putting a little water or something in cylinder # 6. The piston stuck in that cylinder and the rings stuck in the grooves.I disassembled it and found everything else looked like new inside. No ridge at the cylinder tops and rod and main bearings looked great. Everything is standard. I found deals in rings and rod bearings on ebay, but am reusing the main bearings.
