It's the engine that makes the difference. As the insides heat sink it reaches an equilibrium. That's accounted for in the engineering/design phase of development. Ever held a Harley TC88 cylinder head? Massive. Designed to hold the heat for emissions reasons. Takes 3-4 WFO runs after a 5 minute warm up to reach true operating temperature.
you don't see luggage racks on a hearse..........act accordingly