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Message: <blockquote data-quote="becker_atc" data-source="post: 2099494" data-attributes="member: 12903"><p>An engine builder/automotive machinist told me once he prefered to run without valve seals. That it provided a little extra lubrication on startup, more so after sitting long periods of time. He felt his engines lasted a bit longer (lots of older 327s 350s and 454s) but used a little extra oil, not a problem if you check it regularly. BUT most of his customers did not like that as would smoke a bit on startup so mostly this idea was just implemented on his personal engines.</p></blockquote><p></p>