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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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No expert here, but I will say that I don't think you can tell much by the combustion chamber deposits . .. due to the burt valve, it's been burning funny (low compression) for a while.
Valves burn, more often than not, when the valve isn't returning to it's seat.
I would guess the hydralic follower (aka 'lifter') or the spring are problematic. Else, it just hapeen to get a chunk of carbon build-up (or other) stuck on the valve seat.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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