Cometic C10042 MLS Cylinder Head Gasket Bore Thickness - 4.125in 040in

The Cometic C10042 is a Multi-Layer Steel (MLS) cylinder head gasket featuring a 4.125-inch bore and .040-inch compressed thickness, engineered for high-performance and racing engine applications. Designed to deliver a reliable, long-lasting seal under extreme combustion pressures, this gasket is equally at home in naturally aspirated, turbocharged, supercharged, and nitrous-fed builds.

Key Features:

• Multi-Layer Steel (MLS) Construction: Built from 3–5 layers of spring stainless steel for superior strength and durability over traditional composite gaskets
• Viton-Coated Outer Layers: Each outer layer is coated with .001" thick Viton rubber, bonded directly to the stainless steel, providing a high-temperature and chemical-resistant micro-seal
• Load-Controlled Embossments: Distribute clamping load evenly across the sealing surface, reducing bore distortion and requiring less overall clamp load
• Dry Installation: No additional sealants or re-torque required when installed on properly prepared surfaces
• Corrosion Resistant: Stainless steel construction provides excellent resistance to coolant, oil, and combustion gases
• Bore Size: 4.125 inches
• Compressed Thickness: .040 inches
• Sold Individually

Installation Note: MLS head gaskets require smooth, flat, and true head and deck surfaces for a proper seal. A surface finish of 50 Ra (roughness average) or finer is recommended. Always torque fasteners to the manufacturer's specifications.

Cometic's race-proven MLS technology, developed through involvement in AMA, NASCAR, NHRA, and IRL programs, ensures this gasket delivers the sealing performance demanded by serious engine builders.