Not a 540 (or cooling) expert, but my only concern is, as you mentioned, that if you are reaching 410 on climbout when OAT's are in the mid 30's, what will they be this summer when OAT's may be in the 80's or higher on climbout? Maybe not worth worrying about until it is further broken in, but they will certainly get higher as the days get hotter. In general, my CHT's tend to rise just about the same amount as the OAT (ie, if OAT goes up 40 degrees, so do CHTs).
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
Last edited by YellowJacket RV9 : 04-09-2018 at 04:00 PM.