I agree a 100% if you look at the hole where the oil comes in the roller tips it's pointing straight up, if you look at the hole in the stamp steel the hole for the oil is pointing at the stud and I have drippers in my covers and it still didn't help. But now with my stamp steel no discoloration

I forget, What blocks are these ? Has this been an issue since you owned them ?

In the video of me spinning the engine. The engine was stone cold. I feel it on all rockers

it is difficult to hear a dead cylinder or a low cylinder when the engine is running with loud exhaust. the engines will still sound and run relatively good unless its a severe problem like a hole in the piston. And If both engines are doing it I think you should leak both of the motors down. I am pretty sure you are going to find at least one cylinder that is low on the port engine. I’m interested to hear what else is going on with the ticking.

FYI its all valves that are slightly opened to full opened position on both sides of each engine / engine off

gen 4 509 no just eats up rockers ...apparently an oiling issue on top

I pulled all rockers off...Some were not smooth with the ball in them and all were slightly discolored at the bottom. I believe I have a oiling issue still. I am using stock valve covers with drippers.

Gen iv GM, Dart, Workd Products ?
Darts apparently have a lifter oiling issue, especially even side and bigger issue as you get to #8.

I am using Amsoil 20-50w Zrod oil Full Synthetic.. Maybe the viscosity is to high and oil to top of engine is slowed down?

Any other oil recomendations?

heads are 781 gm...old oval port but good up to 650hp