The shop that will be doing my 3 angle valve job called and gave me the bad news that every one of my exhaust valves are trash. Apparently the lead deposits were building up on the seats and beating the valves to death. This, in my mind, is totally unacceptable for any engine at 110 hrs let alone one, advertised as compatible with 100LL fuel. Almost criminal. Lycoming would have put out a service bulletin at this point and replaced all bad valves for free. Cryin shame. $800 later this will be fixed up.