I have a four core Champion in my Bee. Engine is a 512 wedge. I took it on a 200 mile trip yesterday in 105 degree temps, driving on the Interstate, two lane mountain roads and town traffic. I had the AC on the whole trip. The engine temp stayed between 195 and 200 the whole trip, except for one time when it went to 210 going up a steep hill on a two lane in the mountains following some clown for 6 miles that wouldn’t go over 20 mph. I have duel LX cooling fans. Average speed on the interstate was between 70-80 mph.