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Only thing I can use for real information myself is an airplane. With an adjustable A/F and cylinder head temps you can really see the head temps go up when running to lean. Of course in an airplane you are under pretty much full load constantly. We then richen the mixture to bring head temps into range. I am not agreeing or disagreeing with the lean cruise just don't know what is safe. Could certainly use a few more opinions. I wish I had a head temp sensor would certainly help the situation. But that leads to another question. If you have spark plug ring head temp sensors or some other type. What is the maximum safe head temp.