All but 3 rockers have this issue to varying degrees. I'm posting some pics of the worst ones...some just have small spots

 

It may be an oiling issue. Not enough oil, it any at all, getting to the rocker tip.

It can also be to much spring pressure, what springs you running?

 

Need some back ground. Were these in the car? How many miles and were they like that when installed? Did you install them and if so, did you install new pushrods and clean them with a pushrod brush first?

Are they pitted or only discolored? (Hard to tell because photo is blurry)

I would pull the rocker and pushrod on those and check the pushrod for blockage that may be restricting oil.

 

I have no clue on what springs they are, car was built when I bought it. its a 6.0 turbo car

 

yes they were in running car. I believe they have like 5k miles on them. I did not install , were already in car. comp cam pushrods, I would call them pitted but you can feel some of the larger spots with your fingernail but ever so slightly. The rollers were all covered with a pretty good coat of oil when I pulled off the valve covers...I had to spin them and wipe them all off to be able to get a clear pic of the damage

blowing air through pushrods the best way to check them?

 

there are trick flow as cast heads

 

Losing contact with valve stem

 

and what would cause this....not tightened down enough?

 

Probably valve float or something. The axles in the roller tips appear to be walking out too. I would send pics to Yella Terra and see what they say. They may be able to rebuild them.

Try to find out more about your valvetrain too. Like what camshaft, what pushrods and what preload they have on the lifter, what springs and their open & closed pressures, and what installed and coilbind heights are for the springs.

 

It would be a good idea to see what lobes are on the cam and to pull lifters and look for lobe wear while things are apart.

 

It has ls7 lifters and the rollers on them look really good. engines on the way to be rebuilt, will know cam condition when its pulled, lobes looked good from what I could see with it in motor

 

Ive sent them pics waiting for their response. Someone suggested it might be a failure in the hardening process on the rollers??

 

Not sure its a rocker failure, more than likely a float impact failure. The rockers must may be the first link of the chain from a poorly integrated valve train.

Be interesting to see what the rest of the valve train looks like.

 

either too weak of spring pressure, or too heavy of springs for the lifters and pushrods. Ls7 lifters aren't that great really. If the rocker is losing contact with the valve then the lifter can be losing contact with the cam. What happens then is the cam keeps coming around and slapping the lifter, resulting in damaged lifters and dents in the cam