sincitylocal
+1y
The cam determines if/when the valves open, so if your cam is still in the head, you have to look at the lobes to see which valves should be open.
I'm pretty sure there is no possible position for the cam to be in where all the valves would be completely closed at the same time.
On the other hand, if the cam is out, all the valves should be closed.
If they aren't, you need to pull the ones that are open, and check the stems for carbon build-up, or straightness.