Quote Originally Posted by rumrumm
Generally speaking, you can run 1 pt more compression with aluminum heads. But it all comes down to your DCR. Stay under 8.5 and you should be fine with premium gas. I run 10.6 Static compression with 8.46 Dynamic compression. No problems with 92/93 octane.
Thank you for posting this information. I've been trying to get the relationship between SCR, DCR, squish, cranking compression and octane from other folks. I know how it works on my stuff, I just wanted to get a feel for the combinations others use. Do you know your cranking compression with this combination? Have you tried to run the motor on less octane?

I think I've been "leaving some on the table" with my conservative ideas.