You can also remove the rocker shafts / arms while the stems are soaking. After they sit a while, gently tap each valve with a mallet. If any valves are stuck, they will sound different & you can concentrate on them.
Do not be too surprised if you tap one or more & they move but do not come back up right away. Just add more oil.
While they soak you can take photos for us.
But if I do that won't it hurt it's found in barn survivor status? Lol
