Copperseal Exh Gasket SBC

The Mr. Gasket Copperseal Exhaust Gasket for Small Block Chevy (SBC) is a purpose-built exhaust header and manifold gasket designed to seal high-temperature exhaust port connections reliably. This copper-construction gasket features 1.500-inch round ports and ships as a pair, providing OEM-replacement or performance-upgrade sealing for SBC engine platforms across street, strip, and vintage applications.

Copper construction delivers superior thermal conductivity and conformability compared to standard composite gaskets, allowing the material to expand and contract in sync with header and engine-block movement during thermal cycling. The 1.500-inch round port geometry matches common SBC exhaust manifold and header bore diameters, ensuring proper flow characteristics and port alignment. At 0.73 lbs per pair, this gasket set is engineered for bolt-down installation without shims or additional hardware—a straightforward swap requiring only manifold removal and existing fastener reuse.

SBC platform users rebuilding engines, upgrading to aftermarket headers, or servicing aging manifold seals rely on gasket quality to prevent exhaust gas leakage, which degrades performance and draws unfiltered air into the combustion chamber. The Mr. Gasket SBC copperseal gasket is a go-to solution for street rod builders, classic muscle car restorers, and engine shops standardizing on proven gasket materials. Whether replacing OEM seals on a vintage 350 or installing fresh headers on a stroker build, this gasket delivers the thermal stability and port fidelity expected in serious engine work.