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As far as the smaller Ex valves & less flow. The official HD Training Manuals (don't ask how I get 'em) are noted that HD was trying to increase Ex port velocity & anti-reversion.. That kinda worked, but with side effect..Big heat diff...
Sure changing heads, or porting em is an option. But you shouldn't have to do this $$ to a brand new bike to lower running temps IMO...I've been at long redlights with TC w/95" kit & cams in Fla.. And I felt like I could fry eggs from the tremendous heat..
Mission Accomplished (as was posted)..
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