4.200 MLS Head Gasket .030 - SBC

The 4.200 MLS Head Gasket .030 from Cometic Gaskets is a premium multi-layer steel gasket designed specifically for small-block Chevy (SBC) engine builds that require precise sealing at the cylinder head interface. This gasket is essential for anyone involved in rebuilding or modifying an SBC, whether for classic muscle car restoration, street engine builds, or high-performance racing applications.

With a .030-inch thickness, this gasket is on the thinner end of the MLS spectrum, making it ideal for applications where head deck height and compression ratio need to be tightly controlled without compromising sealing integrity. Cometic's multi-layer steel (MLS) construction utilizes alternating layers of stainless steel with elastomer coating, providing a superior seal that flexes with engine movement while resisting blowby and coolant leakage. Unlike traditional composite gaskets, MLS gaskets maintain their sealing integrity across repeated thermal cycles, which is crucial for high boost, nitrous, or sustained high RPM scenarios.

Mechanics and engine builders who choose the 4.200 MLS Head Gasket .030 benefit from Cometic's proven track record in street, strip, and naturally aspirated applications. This gasket's 4.200-inch bore diameter accommodates standard SBC cylinder spacing, and its .030-inch compressed thickness allows builders to maintain tighter tolerances on piston-to-valve clearance and overall compression ratio, particularly valuable in modified or stroker engines where factory deck heights may not apply.