4.540 MLS Head Gasket .075 - BBC

The 4.540 MLS Head Gasket .075 - BBC is a precision cylinder head gasket engineered for Big Block Chevy engines requiring a multi-layer steel design. This gasket serves as a critical sealing component between the cylinder head and engine block, preventing combustion gas and coolant leakage in high-performance and rebuild applications. Whether you're restoring a classic BBC engine or upgrading a street or competition build, this Cometic gasket delivers the bore diameter and compression thickness specifications necessary for proper engine assembly.

This head gasket features a 4.540-inch bore diameter matched to large-displacement Big Block Chevy platforms and employs a 0.075-inch compression thickness to achieve the desired combustion chamber volume and compression ratio. The multi-layer steel construction provides superior durability, heat resistance, and repeatability compared to single-layer designs, making it ideal for turbocharged, supercharged, or naturally aspirated engines operating at elevated temperatures and cylinder pressures. Cometic's manufacturing precision ensures consistent sealing surface contact and minimizes the risk of head gasket failure during startup, cruising, and full-throttle operation.

Engine builders and enthusiasts working on Big Block Chevy platforms will benefit from the reliability and exact-fit design of this Cometic gasket. Installation requires proper cylinder head torque sequencing and adherence to manufacturer specifications to ensure optimal sealing and prevent warpage. This gasket is compatible with BBC engine blocks and heads featuring the 4.540-inch bore specification and is supplied as a single unit for one-engine applications. For custom builds, racing applications, or OEM restoration work, the 4.540 MLS Head Gasket .075 - BBC remains an industry-trusted solution for professional and enthusiast engine assembly.