The SILICON rubber valve cover gasket really do work. I have them on 2 engines and no leaks. One engine has had the covers on & off 3 times for normal maintainence and still no leaks from the silicon gaskets(now 40k miles). The other engine has had the covers off once.
2 words of advice - torque the nuts to the spcified value that comes with the gaskets(this is less than Porsch's spec.) - DO NOT wash the gaskets in any solvent, just wipe them when re-installing. I do not think you will be disapointed with these gaskets, besides they have a lifetime warrenty.
Ken
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