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.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
