Speedmaster heads for SBM

Ok I finally got around to watching his video. If you guys go back and watch this video again if you watch the vertical manometer on the left side as he goes from .200 to .300 then to .400 and probably .500 you will see the fluid drops and is being raised back up with the knob on his left everytime he opens the valve. At the upper lifts you will see he had to lower it to 28 inches of depression instead of raise it. I immediately knew he lost flow and the head was going turbulent. As he said it’s usually the shortside needing more area. With my bench being an orfice bench I will see that a lot faster than he will on a fluid manometer. I don’t miss my old bench one bit. I still didn’t see how he is locating that head on the head mount. It’s so important to consistently locate it to see your gains or losses during your porting. I have two small block Chevy mounts (big bore and small bore) two big block Mopars, .030 over 440 and 4.500 bore, one small block Mopar (4.010 bore) and one small block Ford. I will be building one for LS Chevy heads next. All use a head gasket and are drilled and tapped for head bolts or studs.