Cometic C5489-040 MLS Cylinder Head Gasket GM Bore - LS1/LS2/LS3/LS6 4.100 040

The Cometic C5489-040 is a Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM LS Gen-3 and Gen-4 small block V8 engines, including LS1, LS2, LS3, and LS6 applications. This precision gasket features a 4.100-inch bore diameter and .040-inch compressed thickness, making it ideal for performance builds and engine rebuilds requiring reliable sealing under high compression and extreme temperatures.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior durability and conformability
• 4.100-inch bore diameter accommodates stock and slightly overbored LS engines
• .040-inch compressed thickness for precise compression ratio tuning
• Engineered for LS1, LS2, LS3, and LS6 Gen-3/Gen-4 small block V8 engines
• Embossed stainless steel layers with elastomeric coatings ensure maximum sealing
• Resists gasket failure from extreme cylinder pressures and temperatures
• Compatible with aluminum cylinder heads and engine blocks

Cometic MLS head gaskets are the gold standard in performance engine sealing, featuring multiple layers of stainless steel with specialized coatings that maintain seal integrity through thermal cycling and combustion pressure spikes. The .040-inch thickness allows engine builders to fine-tune compression ratios for naturally aspirated, supercharged, or turbocharged applications. This gasket is designed to handle the demands of high-performance street engines, track cars, and race applications where reliability is critical.