At 343,000 miles I started an auto-rx application, the valvetrain was making some noise, I had a bad pushrod so I went ahead and replaced all of the pushrods and put on new rocker arms.
This is a small block chevy, anyways at 367,000 miles I took the valve covers off to put on different baffles for the PCV hole and breather hole. The inside of the valve covers were spotless as well as the rocker arms.
When I get a chance I will post some photos, I also have the old rocker arms and I will take some pictures of those too.
I have no more valve train noise, and when I go to pour the oil into the engine I can here it going down to the oil pan, this has me believing that oil is hitting clean metal on it's way down to the oil pan.
My oil pressure is 30 psi at idle and when I am driving I think it is at about 45 to 50 psi, its kind of hard for me to judge since I have an oil pressure gauge that looks kind of like this:
( 0-30-60 )
The engine makes no smoke on startup or when I am driving, and it does not leak or consume oil.
These are my observations that auto-rx works, I am getting 21 m.p.g. and I am happy.