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Any one have the materials and hardness spec for the EXH. and INT. valves on a 0-145-B2. Nope, Lycoming no longer has those specs. other than the engine handbook that describes them as: austenitic steel having a nitrided stem. The rep told me the exhaust valves were not sodium filled. How about some servicable valves???? Howard the 0-145 masochist. 