I have been running the o-370 8.5:1 in a Javron wide body for 8 years now and have come to the conclusion that the oil cooling system design needs particular attention. Regularly fly at above 100 deg OAT and never see more than 370 deg CHT but 210 to 230 deg oil temp is common at these ambient Temps.
I have a sweet spot to fly. Too slow and temps go up. Too fast and temps go up. 2300 at 22 inches. About 78 knots. It's all about managing the power produced / air speed. Fly at gross weight in these temps and you must be diligent.
Before all you boffins start another oil temp debate and start criticising my baffles. They are fine. Just saying, if you are designing a build using a high HP motor, think about the oil temp issue.
Appart from that, a sweet sweet motor built by Aerosport. Rarely use all that Hp but when you need it, it's great. It's like a little money in the bank.
Goldy