Sometimes even all factory stuff on the heads needs to be refreshed. It is possible that you have a burn or worn valve or valve seat if the valves don't completely seat. In higher compression engines you will find out quick if this is the case when you really put your foot in it. The heat on the lip of the intake valve will detonate the fuel/air mix in the intake manifold even if you have adjusted the rocker nut.
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Junk is something you've kept for years and throw away three weeks before you need it!
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