Maybe... all of these heads (Speedmaster, ProMaxx, Airwolf, etc.) could all be manufactured at the same factory or factories in China. The head companies just place orders and have their name put on a box, or etched into the end of the head.
Same for the big block casting out there. I bought some PC vectors after speaking with Jeff at MCH. He advised that the castings were decent but to buy them bare and build them using good valves, springs, etc.
That would be my thought as well.
All I would add to that is consider the guides also....
To all of this, all I would like to know is has anyone run a set of these successfully for an extended period of time....If 1 person has then we know it can be done. I know the set in this post is in very good hands. Wish that is all I would have said in my first post
