4.630 MLS Head Gasket .040 - BBC

The 4.630 MLS Head Gasket .040 - BBC from Cometic Gaskets is designed for serious big-block Chevy builders and performance enthusiasts who require precision sealing under high cylinder pressure and temperature fluctuations. This multi-layer steel gasket is the industry standard for high-horsepower BBC applications, suitable for both street and competition engines.

Utilizing Cometic's MLS (Multi-Layer Steel) technology, this gasket features precisely engineered layers of spring steel with elastomer facing, creating a reliable metal-to-metal seal. This design effectively resists blowout, thermal cycling, and combustion pressure spikes that can compromise conventional composite gaskets. The .040-inch thickness is optimal for most BBC applications, ensuring compatibility with standard cylinder head and block surfaces.

Engine builders, whether working on mild street machines or fully prepared race engines, trust this gasket for its proven performance across nitrous, turbo, and blower platforms. The 4.630-inch bore diameter is critical for maintaining proper ring positioning, enhancing sealing integrity and piston ring longevity in both naturally aspirated and supercharged setups.