Originally Posted by
Intruder
Even the B5F version seldom reaches anywhere near max EGT on takeoff...
Exactly... that's the 'flat-rating', even though nobody really calls it that. That same thrust is attainable at higher density-altitudes because there's still 'room' left before reaching max EGT.
Also, the 767 uses B6F and B7F versions. Not sure if there are any higher than that.