4.060 MLS Head Gasket .040 - Chevy 4.3L V6

The 4.060 MLS Head Gasket .040 - Chevy 4.3L V6 from Cometic Gaskets is a precision cylinder head gasket engineered for engine builders and mechanics performing top-end work on small-block Chevy V6 platforms. Whether you're rebuilding a factory engine, upgrading compression, or restoring a truck with higher-octane fuel capability, this multi-layer steel gasket provides the controlled compression thickness needed to dial in exact combustion chamber volumes. Head gaskets are critical sealing components—they must withstand cylinder pressure, coolant and oil passages, and thermal cycling without leaking or blowing out.

This gasket features multi-layer steel (MLS) construction, which uses stainless steel layers with elastomer coatings to create a conformable, reusable seal that handles both boost and naturally aspirated applications. The 0.040-inch compression thickness is the key specification—it directly determines the effective compression ratio by controlling the volume between the piston at top dead center and the combustion chamber. A .040 thickness sits in the middle range for 4.3L builds, making it ideal for mild to moderate performance builds or stock restorations where you want factory-style compression without shaving heads. The 4.060-inch bore diameter matches the Chevy 4.3L V6 cylinder size precisely, ensuring proper sealing around each bore without excess material that could cause gasket creep or detonation issues.

Mechanics and engine builders working on Chevy 4.3L V6 engines—common in trucks, SUVs, and marine applications—benefit most from Cometic's OEM-quality design. Installation requires proper head torque sequencing and clean mating surfaces; many builders use a light coating of gasket sealer on MLS gaskets for added insurance. This gasket is sold individually, so order the correct quantity for your cylinder count and ensure you're also replacing valve cover gaskets and intake manifold seals during a full head gasket job. Verify your engine's exact bore diameter and desired compression ratio before purchase to confirm this .040 thickness meets your build goals.