4.125 MLS Head Gasket .060 - SBC

The 4.125 MLS Head Gasket .060 - SBC from Cometic Gaskets is engineered for small-block Chevrolet builders who demand reliability and precision in their engine builds. Metal laminate steel (MLS) gaskets represent the modern standard for high-performance and street applications, replacing older conventional designs that compromise under boost, heat cycling, and elevated compression ratios. This gasket is purpose-built for enthusiasts rebuilding SBC engines where repeatability, durability, and sealing integrity are non-negotiable.

MLS construction uses multiple layers of hardened steel with elastomer facing to create superior sealing without relying on copper or asbestos, allowing the gasket to flex microscopically with cylinder head expansion while maintaining a consistent clamp load across operating temperatures. The .060-inch thickness specification is critical—it's calibrated to work with specific deck heights and chamber volumes in small-block architecture, ensuring proper compression ratios and combustion chamber geometry. Cometic's manufacturing tolerances guarantee consistent bore sizing (4.125 inches) and uniform layer integrity, preventing failures from thermal cycling, coolant leakage, or combustion gas blow-by that plague inferior gaskets in turbocharged, supercharged, or high-RPM applications.

This gasket suits any SBC rebuild—whether naturally aspirated street engines, LS-swap foundations, or dedicated race builds—where you're investing time and money into machine work and want the head gasket to outlast the engine's intended lifespan. Installation requires proper head torque sequencing and a clean deck surface to ensure full gasket contact; pay attention to your engine's specific torque specifications and always use new fasteners on reassembly. Compatible with all standard small-block Chevrolet cylinder heads (350, 383, 427, and variants) where bore diameter matches the 4.125-inch specification.