4.160 MLS Head Gasket .040 - GM LS1

The 4.160 MLS Head Gasket .040 - GM LS1 from Cometic Gaskets is the sealed chamber component every LS engine builder relies on when assembling or rebuilding a high-revving performance motor. This multi-layer steel cylinder head gasket sits at the critical junction between the cylinder head and engine block, sealing combustion pressure while maintaining precise bore concentricity and compression thickness. Whether you're freshening a stock LS1 or preparing an aggressively modified platform, this gasket handles the thermal and mechanical stress that separates reliable power from catastrophic failure.

Cometic's multi-layer steel (MLS) construction provides the durability and conformability needed in modern aluminum head applications. The 0.040-inch compression thickness is engineered to deliver the correct quench distance and static compression ratio for LS1 platforms, ensuring optimal combustion chamber sealing without sacrificing engine geometry. The 4.160-inch bore diameter matches OEM LS1 specifications precisely, while MLS technology eliminates the failure modes common to older composite gaskets—it won't shrink, won't blow out, and won't corrode when exposed to coolant chemistry or aggressive fuel additives. Each gasket is individually inspected and manufactured to exacting tolerances that meet or exceed OEM performance standards.

LS1 engine builders—whether tackling stock 5.7L rebuilds, forced-induction applications, or naturally aspirated race builds—depend on this gasket to hold compression and prevent blow-by across thousands of heat cycles. Installation requires proper head bolt torque sequencing and the correct surface prep; OEM or ARP head bolts with specified lubrication and tightening procedures ensure the gasket seats correctly and maintains its seal under load. Compatibility is exclusive to GM LS-Series engines with 4.160-inch bore dimensions, making this gasket a direct fit for LS1, LS6, and comparable variants that use identical deck height and bore spacing.