CHT increase
Since i got my plane I have put 200 hours on it and use as a guide scale where the needle pointer is on the printed letters "CYLINDER HEAD TEMP" markings on the CHT gauge as a benchmark of operating temps at different phases of flight,I have noticed in cruise this CHT consistently sits in the green range with the arrow between the E and the A of the HEAD part of the markings, however over the last several flights in cruise it is running slightly hotter between the A and D markings (still well withing the green range) concurrent with the slight increase in CHT during cruise ( all settings being equal RPM/Leaning OAT ETC) I have noticed during engine run up the left mag has a slightly higher drop then usual , more than the right but again well withing tolerances. What factors could cause this new slightly higher cruise CHT reading ?
Note the engine is 200 SMOH all other engine/air/electrical/fuel systems were renewed at OH