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After 3 oil changes with metal in the filter on my IO-360 A3B6D and the "lets check it every 25 hours and see" advice I was getting I couldn't take it any longer and had to go in for the inspection. I ditched the MSC and got a mechanic that would help me out with an owner assist and so far I'm very pleased with being involved. I was convinced that I had a piston pin retaining plug wearing on the cylinder walls but the borescope showed no such evidence. The 3 oil analysis was indicating an increase in Aluminum and chromium. I was surprised after the 2nd oil analysis I sent in the filter as well and that came back normal with primarily Aluminum. After 82 hours(approximately 12,500,000 revolutions) of flying uncomfortably it was time pull things apart. After opening things up this is what we found! A broken exhaust valve spring on #4. On the onset of the project I decided that I was going to pull all cylinders because of some weeping of oil and a through bolt. If things looked good, which they did, the cylinders where going to be sent to Ly-Con to be Ported and flow balance (they claim 4 to 5 Hp per cylinder and smoother). This engine was an original lower end and only 1450 hours, I was concerned that it would have some evidence of corrosion but the inside was perfect, couldn't have looked any better. So I order a new a new Planes Power alternator, Sky-Tech ultra lightweight starter, vacuum pump, stand by vacuum(precise), some new hardware and all new hoses. I'm planning for TBO and beyond, wish me luck! Karson