4.320 MLS Head Gasket .030 - BBC

The 4.320 MLS Head Gasket .030 by COMETIC GASKETS is designed for serious big-block Chevy (BBC) builds, ensuring maximum cylinder sealing integrity. This multi-layer steel (MLS) gasket is ideal for high-performance engines that require reliable compression retention under extreme combustion pressures. Whether you're constructing a street-strip vehicle, a competition engine, or restoring a classic muscle car, this gasket is essential for a dependable build.

Cometic's multi-layer steel construction features bonded steel layers with elastomer facing, which helps maintain consistent clamp load across the entire bore surface. This design effectively prevents micro-leakage at the critical cylinder-to-head interface. The .030-inch thickness is specifically engineered to work with various deck heights and head gasket surface finishes, directly influencing the static compression ratio.

This gasket is particularly beneficial for BBC engine builders utilizing modern aftermarket cylinder heads, ported factory castings, or performance block combinations where precision is crucial. Its design eliminates the need for re-torquing after initial assembly and resists blowout failures common with traditional composite gaskets in high-boost or high-RPM applications.