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Message: <blockquote data-quote="300WSM" data-source="post: 2099081" data-attributes="member: 6329"><p>Wouldn't marvel or sea foam just clean the journals, thin the oil, and probably make it smoke more if the valve seals are shot?  You might try some of that restore crap.  It might help.  Or just let it smoke and make sure you keep enough oil in it.  If it still has good compression you should be able to change the valve seals without pulling the heads if you are careful not to drop one down the hole...</p></blockquote><p></p>