Engine Header Gasket Set Small Block Chevy Square Port Aluminum MaterialPair ProformPROFORM soft conforming aluminum gaskets easily conform to the collector flanges for a superior seal. Durable, theft resistent clamshell packaging. Each kit comes with 2 gaskets. Sold as a pair. Product Details: Engine Header Gasket Kit Fits Small Block Chevy Engines With Square Exhaust Ports Made From Soft Conforming Aluminum Material Easily Mates And Conforms To The Surface Of Exhaust Headers Provides A Great Seal Each Time Sold As A Pair