This is interesting to see the valves rotating at high rpm(Check the red mark on the spring pocket)

cool video, question tho, is the mist (smoke?) coming out at higher RPM just misted oil, or is it steam boiling off the engine after a bit of a sit? just curious. cheers B

I believe that it is only misted oil.
I cannot see the valves leaking and the compression coming up in the valve cover. The pressure would take the path of least resistance and go into the exhaust pipe.
The question is why the valves are turning..... This is good as the valves are wearing evenly, but why only at high rpm?