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running hot can often be directly linked to leaking head gaskets, not blown, but just leaking enough to heat the coolant and add some pressure to the radiator. there is a chemical test where you pull some of the air from the radiator to see if there is combustion gasses in it. i have seen this...

ron, the multifuels top of torque curve is 1900 rpm, after that power drops off. when the same engine was used in white tractors, etc, gov was set for 2200 rpm max. engines in military vehicles are expendable, and many come with govs set too high, but for private owners i would never run it past...