Cometic C5489-120 GM MLS Cylinder Head Gasket Bore - LS1/LS2/LS3/LS6 4.100

The Cometic C5489-120 is a premium 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 gasket features a 4.100-inch bore diameter and .120-inch compressed thickness, making it ideal for performance builds and high-compression applications.

Key Features:

• Multi-layer steel construction provides superior sealing and durability under extreme conditions
• 4.100" bore diameter accommodates stock and slightly overbored LS engines
• .120" (3.05mm) compressed thickness allows for precise compression ratio tuning
• Compatible with LS1, LS2, LS3, LS6, and other Gen-3/Gen-4 LS small block V8 engines
• Premium gasket material resists blowout and maintains seal integrity in high-heat, high-pressure environments
• Precision-manufactured for consistent thickness and reliable performance

Cometic MLS gaskets are a trusted choice among engine builders and performance enthusiasts for their proven ability to seal effectively in boosted, naturally aspirated, and high-compression applications. The layered steel design allows for minor surface imperfections while maintaining excellent combustion sealing.