The Edelbrock Performer RPM 5. 0 Gasket Set includes base-to-upper and plenum cover gaskets. They are tailored to perfectly match the Edelbrock intake manifolds. The same base is used, as the Performer 5. 0 manifold, but the upper plenum has shorter runners with a large cross-section for more power. These base and plenum cover gaskets are designed for the Edelbrock # 7126.