This past weekend with temperatures in the mid 90's and humidity high in the Fort Worth/Dallas area I drove my 70 SS 396 (with mild cam and bored .30 over) on eight trips of 30 miles each on an interstate (back and forth to a swap meet). Several times the guage read 230-240 degrees and once all the way to 250 degrees. The car has air conditioning and I had it on. Coolant level is OK and it has a new thermostat. My speed was 60-65. Anybody think this is abnormal? I don't like the idea of running at 250 degrees. One chevelle fan at the swap meet suggested I find a 68 chevelle fan shroud because he said it covers the whole radiator and mine leaves about 4-6 inches of radiator showing on the drivers side. I do have a 4 core radiator. Anybody have any ideas other than don't drive over 30 in hot weather?