4.280 MLS Head Gasket BBC - 8.1L LH Merc Marin

The 4.280 MLS Head Gasket BBC - 8.1L LH Merc Marin from Cometic Gaskets is a precision-engineered cylinder head gasket designed for large-displacement marine and automotive big-block Chevrolet engines. This multi-layer steel gasket is specifically designed for the left-hand (driver-side) location on 8.1L Vortec and comparable BBC platforms, making it essential for engine builders, marine technicians, and high-performance enthusiasts performing head rebuilds or engine restoration.

Cometic's multi-layer steel (MLS) construction delivers superior sealing performance compared to conventional composite gaskets, particularly in high-boost or high-compression environments. The 4.280-inch bore diameter matches the exact cylinder opening of your BBC platform, while the 0.051-inch compression thickness maintains factory-correct combustion chamber volumes and prevents detonation or pinging. MLS gaskets rely on elastic retention and precision facing to create a gas-tight seal across multiple steel layers—a proven design that resists blowout and maintains integrity through thermal cycling.

This gasket is specifically engineered for driver-side cylinder head installation on 8.1L Vortec big-block Chevy engines and compatible marine powerplants. Proper installation requires a clean surface and adherence to torque specifications to ensure optimal performance and longevity. Engine builders and technicians will find this gasket to be a reliable choice for both marine and automotive applications.