Thanks for the feedback lokeetl. It was 92F the day I was flying. I'll have to check the head temp the next time I fly. The cowl I have does not have a baffle in it but the bottom was opened up to clear the Pitts Style muffler the previous owner had on his OS91FX. It would seem that there should be plenty of air going through but who knows.

Thanks again for the tip. If need be I'll throw a 4 stroke in it.

Bob