[tharbert]

If it was running dry, you'd see the damaged cam lobes and rocker faces easily. Post a pic of the cam and rocker, especially the rocker face that rides on the cam.

Did the rocker break? Or, was it just loose? The rocker shaft, if not positioned property and torqued correctly, can "walk" out of it's bore.

If it's actually broken, they are designed to break upon valve/piston contact but damage isn't normally avoided. Hope you don't have to go there...