4.220 MLX Head Gasket .040 - SBC

The Cometic Gaskets 4.220 MLX Head Gasket .040 - SBC is a multi-layered stainless steel cylinder head gasket engineered specifically for small block Chevy engines. This gasket combines precision bore diameter with optimized compression thickness to deliver reliable sealing across a wide range of engine configurations, from naturally aspirated builds to moderately boosted applications. The MLX construction represents Cometic's proven multi-layer technology, designed to maintain consistent compression and prevent combustion gas leakage over extended service intervals.

The 4.220-inch bore diameter accommodates common small block Chevy bore sizes, while the 0.040-inch compression thickness is the industry standard for balanced clamping force and gasket crush. This thickness specification ensures proper sealing without over-compression that could damage facing materials or create hot spots that promote detonation. The stainless steel core resists corrosion and thermal cycling degradation, extending gasket life in both street and performance environments. Cometic's MLX gaskets are manufactured to tight tolerances, reducing the risk of failure from uneven seating or localized pressure spikes.

This gasket is ideal for engine builders, restoration shops, and enthusiasts rebuilding or refreshing small block Chevy powerplants. Whether assembling a stock replacement engine, a period-correct restoration, or a performance upgrade, the Cometic 4.220 MLX head gasket provides the durability and sealing integrity required for trouble-free operation. It's a critical component that bridges cylinder head and block surfaces, making proper gasket selection essential to engine reliability and longevity. Each gasket is sold individually to match your specific engine rebuild requirements.