I'm using Aluminum Edelbrocks. I have quench too. And I've smoothed any sharp edges for hot spots and fit cyl head chambers to block to un-shroud valves and reduce point for hot spot.
I've seen some engine builder say that aluminum head 1/2 to full point detonation resistance is over exaggerated.
Tnx. that is good reference info. And, yes, I generally think of a half a point of advantage being what you can count on with AL heads. So then the timing and effectively smaller cam and the fuel come into play.
When running oxegenated fuel, the combustion speed is lower and so timing would logically be increased, but the slower burn of MTBE may still make the combustion slow enough to increase detonation possibilities. Gasahol burns faster so is better in that regard.
