Recently did a valve adjustment on my '91 RS Integra and about twenty miles it starts knocking a lil louder than usual ( always had a small rough knock during start but would get quieter ). I double checked the timing of the crank and cam, and even re-installed the timing belt to make sure. Checked valve lash - both intake and exhaust side were within spec. Pulled the head because I knew I had a bad HG and after pulling it off, this is what I found on the camshaft holder side on cylinders closest to timing belt:



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The noise was coming from the head and as you can see in the pics, there are scoring marks from the rocker arms slamming against the head. What could cause this?

edit- I did mis-shift it once about 1-2k miles ago, but caught it pretty quick. it obviously went over redline

 

How do the rocker arms look? I'd put it back together and go with it. Make sure the lash is correct again.

 

The rocker arms look fine - the cam lobes look great too. Hell, for almost 200k, I'm surprised the head is this good.

it still doesn't explain why would this randomly happen?

I'm taking the intake manifold off at the moment to take the head to a machine shop to make sure none of the valves are bent -- But, all are in the down position, smooth, so I dont think they're a problem. Still going to have them change the stem seals

 

possible rod knock?