@NC Engine Builder I wish you were not so far away, Tim and I would jump in and help out. I have been planning for this same test for a while now and would only be missing the bloomer heads at this point. I have literally every other head you mentioned and more including a fresh 410 short block. Tim has w2 intakes, rockers, tunnel ram hooker 5303's and I have some Brett Miller ported w5s with an intake and race headers, bummer!