4.375 MLS Head Gasket .040 - BBC

The 4.375 MLS Head Gasket .040 - BBC from Cometic Gaskets is engineered for serious big-block Chevy builders and high-performance engine shops seeking reliable cylinder sealing under extreme combustion pressures. This gasket is designed for applications that require high durability and performance, making it suitable for street performance, racing, and supercharged engines.

Cometic's MLS (Multi-Layer Steel) gasket design utilizes multiple specially-coated steel layers that compress evenly to create a conformable, gas-tight seal. The .040-inch thickness specification is critical as it directly affects chamber volume, compression ratio, and combustion dynamics on your big-block platform. This gasket is built to withstand repeated thermal cycling and peak cylinder pressures, ensuring long-term reliability.

The 4.375-inch bore diameter is precisely matched to BBC applications, ensuring complete coverage of all cylinder bores while maintaining proper gasket clamping load distribution across the head surface. This gasket is ideal for anyone looking to enhance their engine's performance and reliability, particularly when upgrading from factory gaskets to a more robust solution.