Hello
1.) make sure you have the correct aluminium washer and the correct nut. They have an special high temperature nylock insert. Normal inserts will leak and suck the oil.
2.) Like John pointet out there are other resons. one is an leaking upper valvecover. If you overthight them they will stand up in the corner and like unvisible into the cap beetween shroud and cam housing.
Early thin black covers are a good partice to learn how to thight down correct. Hihgest level is needed for 901 engines ( 6 studs and cork )
Grüsse
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