Have an odd problem that is probably stiction from the break in oil.
Mocking up valve train on a new build and the cam "creaks"like a door hinge.
Remove any 8 pushrods ,noise goes away .Only with full load of all 16 pieces. New roller etc.It's not the lifters or the pushrods or rockers

No intake on engine,can clearly see and hear it is the cam.
Bar it either direction, "creaks".
Remove some push rods,no sound.
Cam turns free by hand.
Primed the oil system and rotated. Still does it.
I come to believe it's the oil,it's break in oil with whatever is in that stuff.
If you ever tried to tighten a headbolt more ,that chatter /creak is how it sounds

Anyone ever experienced this?