This is what I use and I have no problems at all. I pulled this off of the SummitRacing Website.
Look at Fel-Pro # VS12869T
They resist high heat and vacuum.
Fel-Pro's PermaDry Plus valve cover gaskets feature precision edge-molded silicone rubber, which resists high heat and delivers reliable sealing on irregular surfaces. This silicone rubber is wrapped around a rigid carrier that adds strength to the gasket, to resist being sucked in under high vacuum or blown out when under pressure. At the same time, it also prevents over-tightening of the mounting bolts. Note, however, that these gaskets are not intended for race applications.
FEL-VS12869T $33.99
Brand: Fel-Pro
Product Line: Fel-Pro PermaDry Plus Valve Cover Gaskets
Gasket Material: Embossed shim with precision rubber coating
Quantity: Sold as a pair.
Valve Cover Gaskets, PermaDry Plus, Embossed Shim with Precision Rubber Coating, Chevy, Small Block, Pair
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