4.320 MLS Head Gasket .045 - BBC

The 4.320 MLS Head Gasket .045 from COMETIC GASKETS is specifically engineered for Big Block Chevy (BBC) engine builders and enthusiasts who require reliable sealing under extreme conditions. This gasket is essential for applications where stock gaskets may fail, such as high-boost scenarios, nitrous oxide injection, or sustained high-RPM operation. It is ideal for those building street machines, bracket racers, or marine engines.

The .045-inch thickness designation indicates the compressed gasket height, which is crucial for maintaining the correct combustion chamber volume and static compression ratio. Cometic's MLS (Multi-Layer Steel) construction features multiple stainless steel layers with elastomer coating, providing superior durability compared to traditional gaskets. This design helps eliminate deterioration under thermal cycling, ensuring a reliable seal.

Engine builders, especially those working with 427, 454, or stroker BBC combinations, benefit from the gasket's spring-back characteristics and dimensional stability. It is suitable for both naturally aspirated and forced-induction applications, maintaining a reliable seal across various operating conditions without the need for constant retorquing.