ProComp/Speedmaster aluminum heads

Well I fell behind a few pages on this post and when I tried to catch up it was way over this country boys head. Rubber heads, efficiency, hot and cold cycles, yada, yada, yada, I just skimmed through those posts. If I had to think that hard I would be to tired to do anything. Carry on.
I was kind of wondering if the characteristics would change at least the way my motor would run not having an open chamber head anymore..
Make that four pages ago...