I too would suspect seized valves at this point. Continue to read up on various cases of this issue and try some of the suggestions. It would be a good idea to put in any info you know about the engine. Things like when it last ran and if you don't know what things are on it just use your phone to take a few pics. It's a good idea to lower the resolution on the camera when taking pics as well because the site here has a size limit.
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Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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