Mr. Gasket CopperSEAL Collector and Header Exhaust Gaskets

Mr. Gasket CopperSEAL Collector and Header Exhaust Gaskets deliver professional-grade exhaust sealing trusted by racers and performance enthusiasts at every level of motorsport. Track-proven in Top Fuel Dragster, Funny Car, and Alcohol class competition, the CopperSEAL line represents the same commitment to leak-free performance that has defined Mr. Gasket since founder Joe Hrudka established the brand in 1964.

Every gasket in the CopperSEAL line is manufactured from dead soft solid copper — a material prized for its ability to conform to flange surface irregularities and maintain a reliable seal under extreme heat and pressure. An embossed O-ring-style design around each exhaust port concentrates clamping force precisely where it matters most, creating a tight, blowout-resistant seal even against imperfect or slightly irregular mating surfaces.

Key Features:

• Dead soft solid copper construction — conforms to header and collector flange surfaces, sealing minor imperfections for a durable, long-lasting exhaust seal
• Embossed port design — concentrates sealing pressure around each exhaust port opening to prevent blowout and eliminate leaks
• Reusable — copper's natural malleability allows removal and reinstallation without sacrificing sealing performance
• Will not shrink or deteriorate — engineered to withstand the punishing temperatures and pressures of high-performance and racing exhaust systems
• Broad product line — available in a wide variety of port styles, bolt circle configurations, and flange types to cover both header and collector applications

Recommended Applications:

• High-performance street and track builds
• Drag racing — track-proven in Top Fuel, Funny Car, and Alcohol class competition
• Oval track and circle track racing
• Turbocharged and supercharged exhaust systems requiring extreme heat resistance
• Tow vehicles and motor homes requiring robust, long-term exhaust sealing

Now part of the Holley Performance family, Mr. Gasket continues to expand CopperSEAL coverage across a wide range of applications. Select the individual part number below that matches your specific header, collector, or muffler flange configuration for precise fitment and a guaranteed leak-free seal.