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Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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The part number for the M8 locknut with the higher temperature rated insert (used on the valve covers) is 900-084-004-02. I'm not aware of an M6 lock nut with these characteristics that is used on a 911 engine. The M6's I know about have the wave type spring washers under them. Cheers, Jim
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