MLS Exhaust Gasket - SBC 1.625 Round Port

The MLS Exhaust Gasket - SBC 1.625 Round Port is a critical sealing component designed for small-block Chevrolet engines running header or manifold exhaust systems. This multi-layer steel (MLS) gasket sits between the cylinder head and exhaust port, preventing combustion gases and coolant from leaking into the engine bay. Whether you're building a street engine, weekend bracket racer, or restoring a classic muscle car, a quality exhaust gasket is non-negotiable for reliability and performance.

Cometic Gaskets engineered this MLS design with multiple steel layers bonded together, providing superior heat resistance and durability compared to traditional composite gaskets. The 1.625-inch round port configuration matches OEM and aftermarket SBC head castings, ensuring a precise fit that minimizes blowby and maximizes sealing integrity under high exhaust temperatures and pressure cycling. The layered steel construction also resists gasket creep—the gradual relaxation that can occur in softer materials—making it ideal for forced-induction builds, nitrous applications, and high-RPM combinations where thermal and mechanical stress are extreme.

This gasket is essential for any SBC engine swap, head replacement, or exhaust system upgrade. It works seamlessly with both cast-iron manifolds and modern tube headers, and installation requires only careful torque sequencing to the manufacturer's specification. Mechanics and enthusiasts building small-block platforms—from 283 to 400 cubic inches—rely on Cometic MLS gaskets to eliminate exhaust leaks that can reduce power output, cause overheating issues, and create unwanted noise. For durability and repeatability, this is the gasket choice for serious builders.