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When loading photos (which is more than I know how to do)you should reduce the size of the files first.
You are correct that it looks like #4 combustion chamber is burning differently than the others. The heavy white deposits are baked on oil -- maybe a ring problem - or valve guide/seal. The others look perfectly normal.
The broken stud in that area probably is not related to that condition - just the luck (or unluck) of the draw. Any competent machine shop should be able to remove the broken stud and install a heli-coil if necessary. -- Dave
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