The headers we used on the dyno had thermistors installed to monitor exhaust port temperature. A good-running engine with the right mixture and timing would usually show an exhaust port outlet temperature of 2K degrees F. at full load. Obviously, at lower RPM and load, the temps were considerably less.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!