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Thanks for that link.


What I started doing about 30years ago was to put a thin coating of black engine-rated silicone sealer on all sides of the cork/rubber gaskets.  This would seal them and prevent the "wicking" of oil throug them, while remaining flexible.  The added benefit was "instant" clean when the gaskets were removed, rather than having to scrape the residue of the gasket from the sealing surfaces.  I also did the same thing with intake manifold gaskets, too.  Even carb base gaskets.  Just a thin coat is all that's needed.


Never had a seeping valve cover gasket on my small block Chevy after I started to do that.


A related issue is the "wickiness" of the brand of motor oil.  "Back then", one friend complained about leaking gaskets on his 383 Chrysler when using Castrol motor oil, but my machine shop operative noted that Pennzoil seemed to wick less on his Chevy pickup.  But that was 25+ years ago and oil formulations have changed some since then.



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