4.060 MLS Head Gasket .040 - GM LS1

The Cometic Gaskets 4.060 MLS Head Gasket .040 – GM LS1 is a multi-layer steel cylinder head gasket engineered for GM LS-series engines requiring precision compression control. This .040-inch compression thickness gasket seals the critical interface between the cylinder head and engine block, where combustion pressure and thermal stress demand reliable containment. Cometic's multi-layer steel (MLS) construction provides superior gasket longevity and thermal cycling resistance compared to traditional composite designs, making it essential for both stock and modified LS1 builds.

The 4.060-inch bore specification indicates this gasket is matched to LS1 cylinder head ports and block deck dimensions. The .040-inch compression thickness is a critical specification—gasket thickness directly affects combustion chamber volume and compression ratio. MLS gaskets offer enhanced sealing layers that accommodate minor surface irregularities while maintaining a consistent seal across repeated heat cycles. This design reduces the risk of coolant or oil seepage, a common failure point in high-mileage or forced-induction applications where thermal and mechanical stress exceed the limits of single-layer gaskets.

This gasket is purpose-built for LS1 engine overhauls, head gasket replacement, and engine rebuilds where OEM or equivalent specification gaskets are required. Street and competition users alike depend on Cometic gaskets to maintain proper sealing and compression integrity during the critical first start-up after engine assembly. Proper installation—with clean deck surfaces, appropriate torque sequence, and quality fasteners—ensures the gasket performs as designed and delivers the longevity the multi-layer construction promises. For LS-series engine builders and shops, the Cometic head gasket is a standard specification component.