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The valve seat can also be damaged by pounding from a bad cam lobe and/or cam follower. Hopefully I got to mine before this happened. I think that this is at least as likely a problem as a bad hydraulic compensator. Of course, nothing "happens" without a cause; in my case, the whole calamity was caused by shrunken oil tube fittings (NOT clogged), not delivering oil to the cam bearings and cam, wearing the cam and follower, banging the valve(s)...and so on.
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