On my engines, the ignition timing was set too far advanced, which resulted in increased CHT, while EGT was normal. Resetting the ignition timing on the magnetos to the correct value remedied the problem.
SavvyAnalysis was of great help in getting me an understanding of the problem, though my mechanic (Jay from Jay's Aircraft at John Wayne Airport KSNA, a real long-time pro, and also a pilot) came to the exact same conclusion without any prompting from me.
Dan
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