18 Degree SBC Copper Embossed Exhaust Gasket

The 18 Degree SBC Copper Embossed Exhaust Gasket (MPN 4111) is a precision-engineered seal designed for Small Block Chevy (SBC) engine builds seeking reliable exhaust manifold-to-cylinder head sealing. This gasket is suitable for both street and competition applications, addressing a critical leak point in any engine—the exhaust port interface where combustion heat and pressure test gasket integrity.

Featuring copper embossing technology and an 18-degree angular design, this gasket mirrors the OEM port geometry of SBC cylinder heads, ensuring optimal sealing surface contact. The copper material allows the gasket to expand and contract with engine temperature swings without permanent deformation, while the embossed facing creates a micro-mechanical grip on both the manifold and head surfaces, effectively locking the gasket in place.

Mechanics and engine builders favor this gasket for stock restorations, mild street builds, and aggressive race engines. Its design is critical for preventing blow-by under sustained high exhaust temperatures and vibration, making it an excellent choice for forced-induction or carbureted high-rpm applications.