RV9A, IO360. Catto Tri-prop. I am now 16 hours into my phase 1 flight on normal cruse seeing 385F CHT at 3,000' cyl. #1 the hottest running, OAT is 76F. On climbs at that altitude 500 FPM they can all push over 400F. what actions have some of you guys performed to bring these temps. down?? Thanks, Mark C. 119RV