Why am I drawn to the aluminum??

I think the term OOTB here is deceiving a little since IMM does the work & then re-boxes them. I'm by no means knocking his work or the quality or value of the heads. But buying heads with the bowls blended & back cut valves etc in them isn't exactly OOTB as they were cast. The greatest gains made are usually in the bowl work. Again, I'm not saying it's not a good deal. But for comparisons sake I think it's not really apples to apples. Not fair to compare a worked head & say it's "not ported" when it clearly has been touched up to a head truly OOTB.