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I had this problem on the RH side of a 380SL. The rocker actually had a significant concavity in it. You MIGHT be able to replace the rocker(s) alone but look at the cam. Mine had scores, gouges, and chunks missing. This will cause the new rocker to fail fairly quickly I'm told. Guess where all that metal went.
The root of my problem was insufficient oil to the RH cam, caused by the oil tube popping out partially due to an old shrunken plastic fitting. This little $3.00 part caused me to have to change the cam ($300), and 8 rockers (70). MB list prices are more than double that, never mind the labor.
I did the timing chain while I was in there.
Following the manual's procedures on cam bearing removal/ replacement/ torquing to the letter is critical on this job. Strip a head bolt thread and the total cost of the project just quadrupled.
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