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Looks like galling from the rocker arm/cam follower due to lack of maintenance or lack of oil. Why did you have to tear into the engine?
 

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2012 limited, white, no moonroof or nav
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All the intakes, or just one? It looks like something got caught in there. If it is all of them, looks like a lubrication failure. Why the oil would fail has many possible answers. I have seen that exactly once before, in a motorcycle engine, one valve only.
 
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