The Edelbrock Intake Manifold Gasket is a perfect companion for the Edelbrock intake manifolds and cylinder heads. They feature an exact port match for the Edelbrock Performer and Performer RPM heads and manifolds for maximum flow and performance. Each manifold has been cast so that there is excess mass in appropriate places for port matching and customizing. It is a top gasket and is mainly designed for big block vehicles. They are meant for the Edelbrock # 7115 and # 7075.