4.375 MLS Head Gasket .040 - BBC

The 4.375 MLS Head Gasket .040 - BBC from Cometic Gaskets is a precision-engineered cylinder head gasket designed specifically for big block Chevy engines in both Gen V and Gen VI configurations. This multi-layer steel gasket serves as a critical sealing component between the cylinder head and engine block, preventing combustion gases and coolant from escaping or mixing. High-performance engine builders and restoration specialists rely on this gasket to maintain proper compression and engine integrity across demanding applications.

Constructed from multi-layer steel, the 4.375 MLS Head Gasket .040 features a 0.040-inch compression thickness that precisely matches factory and performance specifications for big block Chevy applications. The 4.375-inch bore diameter accommodates the full displacement and combustion chamber volume of BBC engines, while the MLS (Multi-Layer Steel) construction provides superior durability, improved sealing surface conformability, and excellent resistance to thermal cycling and pressure variations. This advanced material composition allows the gasket to maintain a dependable seal across repeated heat cycles without permanent set or degradation.

Technicians, engine builders, and enthusiasts working on big block Chevy restorations, performance builds, and street or competition engines will find this gasket essential for achieving reliable compression and preventing leaks. Proper installation requires careful surface preparation of the cylinder head and block deck, torquing fasteners to manufacturer specifications, and verifying correct gasket orientation. The precise 0.040-inch thickness ensures proper combustion chamber volume and compression ratio in Gen V and Gen VI BBC engines, making this a critical component for any rebuild or top-end service.