Cylinder head dyno shoot out

That’s my understanding as well. Now are the speedmaster as cast and cnc the same two heads as the promaxx and shocker?
No. The ProMaxx are castings are machined and assembled in the US (Alabama) as far as I know. I spoke to the owner about having the Shocker treatment performed on the standard ones I have, and he was very good to talk to and the cost was very reasonable, but I didn't follow through at the time.