Cooling Difference in Aluminum heads?

MY aluminum heads seem to take a couple of minutes longer to warm up in the morning. But once up to temp the stat sets the minimum, and the ability of the cooling system to shed heat, sets the max.
The aluminum sucks heat out of the chambers and delivers it to the cooling system, as well as to the underhood area, as well as into the exhaust. Because it it extracts heat so well, you pretty much have to bump up the compression to keep up with iron heads. If you don't the effective C/R takes a dump and performance suffers. The heat is what makes the power. The more heat,the more power, until you get into detonation or something melts,lol. Heat is the secret.
I run 205*F at the stat-house,all the time.Some adventurous types run even hotter.Modern EFI engines run 220 or a bit more. That's partly how those NA teensey 2.5/3.3 engines pull 3200 pound cars around reasonably well.
When running al heads Data seems to indicate that the DCR should be run at least a half point higher, than with iron, and some fellows are pushing over 9.3Dcr in their well executed combos. I run 8.9Dcr on 87E10. That's 10.9 Scr. I can run 36* power timing at 3400, but the engine performs just as well (by seat of the pants) on 32* so I compromised and have run 32/34 since 1999.
She does like a lot of cruise timing tho. I have experimented with up to 60*@2200. Typically I run 44/56 on flat hard pavement.(dial-back timing device)
That's another nice thing about Al heads with a tight Q (mine is .034), it's hard to find detonation on a typical 360 or smaller engine. Well maybe not if you get greedy with timing below 3000,lol.