In addition to the obvious cooling system issues (the previously mentioned thermostat and such), you are indeed wise to check the timing and plugs. Pinging causes the car to run much hotter, and I was able to cure most of my '67's hot-running ills by switching to the Autolite 85 spark plugs I am now so fond of. Switching to the Autolites cured my car's pinging tendency, which brought the highway driving temperature down to the beginning of the normal range. Once I recored the radiator, the car runs, as others have noted, between C and the left end of the normal range, under nearly all conditions. Try the new plugs and setting the timing to spec and let us know what you find! Chris in LA 67 Crown 78 NYB Salon On 6/15/04 12:57 pm, Mike Pittinaro (mechimike@xxxxxxxxx) wrote: > My own thoughts tend towards something wrong with the > engine itself, ie timing wrong, plugs, mixture, etc, > rather than a defect in the cooling system. Am I on > the right track here?