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At the risk of being wrong, again, the chain is a hard steel, the valve cover soft aluminum, the wear marks indicate at one time the chain was not tight enough, hence the wear. You could spend time checking the timing, but #1 & #4 are symetrical in operation, so your problem isn't the cam timing. The clearences are off for stock cams but not the problem, as #2 & #4 are similar but different compression. I don't think stuck carbon on the valves&seats explains it either. The most expedious step is to take the head off to determine the internal problems such as, faulty head gasket, cracked head, bad valve (bent/burned/etc) bad valve spring or seat, bad liner/piston, etc.
 
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