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Unless the cooling system is marginal, I doubt you will see the temperature climb very much in 3 to 5 minutes. I've done many long pulls with my F350 out west at high elevation and the coolant temperature never changes. Sometimes the fan engages but that is probably more because of the AC. You...

As pointed out, about 1200F is a good max. Unless you are going to run it there all day, a few degrees one way or the other won't matter. Putting more air through the engine (lower gear) and/or less fuel will drop the EGT on a long hard pull.