Valve cover gasket opinion...Cork vs Rubber

LJ67barracuda340 said

Mopar Performance P5249581AB - Mopar Performance Valve Cover Gaskets
the last gasket you'll need. had mine off and on dozen times, not a drop.

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Yep, dems the ones although costly. No sealant needed on stock stamped steel vc's, tighten and go, no leaks.