Its as hot as the combustion is, the higher energy.. the more heat .and versa. Actually..heat in the chamber is good.
what happens when the a/f enters a hot chamber? they expand ...squeeze boom and on to he next it must carry ...
Thermal conductivity how fast or slow the transfer, i remeber joe baghojian mentioning it when i was 17 yrs old. He was set on some things now looking back. The aluminum head is cooler in a lot of other areas than an iron head, the intake side for instance. But really aside from flow.. you get a measurable amount of power increase from the closed or faster burning chambers 'let alone quench' than from any benefit of "heat dissipation". imo. and i've run pretty high dynamics with open chambers and quench head pistons and know others who are in the 200+ psi range...and now here is this.. it really boils down to a neccesity for adiquate octane to actually realize the potential, or not leave any on the table ...so why bother beyond dynamics of 8.6 or so if you are octane limited/pump gas...
Ill take an extra 20 cfm over half a point , anyday. In the end ..airflow is king.