4.040 MLS Head Gasket .040 - SBM 5.2/5.9L

The 4.040 MLS Head Gasket .040 for Small Block Mopar 5.2/5.9L engines is a precision-engineered sealing solution designed for builders and enthusiasts who demand reliability in high-performance or stock-rebuild applications. Multi-layer steel (MLS) construction has become the industry standard for modern engine builds because it handles heat cycling, boost pressure, and combustion forces far better than traditional composite gaskets.

This gasket is manufactured using proprietary MLS technology that employs multiple hardened steel layers bonded with elastomer compounds. The .040-inch compressed thickness is engineered to maintain a consistent clamping load across the entire sealing surface when torqued to specification, which is critical for preventing hot spots and uneven pressure distribution that can lead to localized failures.

Ideal for 5.2L and 5.9L small-block Mopar applications, this gasket delivers the seal integrity that prevents coolant seepage, oil migration, and compression loss. The 4.040-inch bore diameter matches the specifications of small-block Mopar heads, ensuring proper alignment with cylinder walls and combustion chamber geometry while the precision edge beading promotes rapid seating and reduces the risk of gasket movement during engine startup and thermal cycling.