4.380 MLS Head Gasket .040 - Pontiac 400/455

The Cometic Gaskets 4.380 MLS Head Gasket .040 is specifically designed for Pontiac 400 and 455 cubic inch engine builds, ensuring precision sealing and durability under high combustion pressures. This gasket is ideal for both street applications and high-performance modifications, making it a valuable component for enthusiasts and mechanics alike.

Constructed from multi-layer steel (MLS), this head gasket offers a significant upgrade over traditional cork or composite options. It features precisely machined stainless steel core layers combined with elastomer facing materials, which effectively prevent blow-by and oil seepage, even under extreme conditions. The .040-inch thickness is engineered for optimal compression ratios, while the 4.380-inch bore diameter ensures proper sealing geometry.

Engine builders and mechanics restoring or modifying Pontiac 400/455 engines will find this gasket particularly beneficial, as it maintains sealing integrity across thousands of heat cycles. Its design accommodates modern fuel blends and extended drain intervals, making it suitable for various performance driving scenarios. Whether for mild cruisers or serious street/strip builds, this gasket delivers the reliability and performance that modern engine builders demand.