[scottj]

Exhaust timing that starts too early, header design, combustion chamber design. Also what EGT temp is the goal? Because of differences in chamber efficiency, old small block chevy race engines would run 1450 EGT while BB chevys would run 1650 EGT when tuned correctly. 9:1 race engines run such high EGT only a stainless header will last on one.

These examples are really development issues more than they are tuning issues, but development is what EGT and the dyno is intended for anyway, to tune the fuel curve on the dyno you must look at the A/F ratio.

Scott