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Ron: If opening and closing your cowl flaps makes no change, I would really suspect bffling problems. Lots of little leaks can equal a big one. I also have a P337 (73) with a factory reman on the rear. My CHT temps, with cowl flaps closed, cruise power (65%), 21-22 GPH, are 375 at the most. Let us know what you find out.
Mark
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Mark Hislop
N37E
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