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I don’t know how hot, how long it takes to toast the motor, but I no longer get too concerned until around 1300 for any period of time. I can hit 1200 empty, running hard from a stop, but my truck has always run very well the way I got it, see post #3.

Stock, the way I got it from the military, mine runs 67 mph at 2100rpm on 14.00’s. 75 at 2400, iirc pushing down hill. 25psi max boost. Occasionally hit 1300 degrees pre turbo, running heavy, and can force it to 1400 lugging, big, long hills before they force me into first gear. One of these...