Cometic C5505-040 GM LS1/LS2/LS3/LS6 Gen III/IV MLS Head Gasket 4.040" Bore

The Cometic C5505-040 is a premium Multi-Layer Steel (MLX) cylinder head gasket engineered specifically for GM LS Gen III and Gen IV small block V8 engines, including LS1, LS2, LS3, and LS6 applications. This gasket features a 4.040-inch bore diameter and a compressed thickness of .040 inches, making it ideal for stock and mild performance builds.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme cylinder pressures
• 4.040" bore diameter accommodates standard LS engine bore sizes
• .040" compressed thickness for precise deck height control
• Compatible with LS1, LS2, LS3, and LS6 Gen III/Gen IV engines
• Advanced coating technology ensures optimal sealing between head and block surfaces
• Resists blowout and maintains seal integrity under high heat and pressure
• Designed for both naturally aspirated and forced induction applications

Cometic's MLS gaskets feature multiple layers of stainless steel with proprietary coatings that allow the gasket to recover and seal surface imperfections. The .040-inch thickness provides a balanced compression ratio suitable for most performance builds while maintaining reliable sealing. This gasket is sold individually and requires proper surface preparation and torque specifications for optimal performance.