A club buddy (very experienced in giant scale construction and flying) put a Fuji 64 in his big P-47. Today, while adjusting the high end needle to get it running smoothly, someone else checked the head with an IR temp gauge and we got a reading of 280 degrees, so the engine was shut down. It's being run with a 25:1 oil ratio, and it's not too lean. We feel that there is enough cutouts in the dummy radial to get suffiecient cooling air to it; however, we'll remove the cowl and try it again. But what would an appropriate head temperature be for this engine at full throttle?