The Edelbrock valve cover gaskets 7580 provide excellent sealing integrity and conformability for easy installation. The multi - layer construction has two highly compressible, high rubber content, fiber - reinforced outside layers which are chemically bonded to a high strength composite core. This unique core - reinforced construction has a radial strength to resist high - vacuum or blow - out conditions. Edelbrock valve cover gaskets are an Edelbrock product.