[rogerspeed]

In the northeast US I owned a Red 2600 for one year back in the late eighties and put 10,000 miles on it. The car would never get much over 160 and I drove it hard. I imagine with all that alumimun arround a relatively small displacement it radiates heat quite well. In fact when operated in winter below freezing at high speed the engine temperature would actually drop unless one used the blind on the intake in front of air cleaner. You might also want to check that the mixture is not too rich which will also promote cool running.