My 216 had a whole lot more smoking through the valve cover vents when I 1st got it running. Blowby was so bad it smoked through all 3 slots when running as wll as when shutdown.
Now with about 1500 miles on it and a PCV valve mod theres very little noticable blowby when running.
I also upped the thermostat from 160 to 180 and this seems to have helped too.
It still steams after shutdown but nowhere near as much as before, pretty much like the posted vids above.
Dave