Cometic C4318-140 MLS Cylinder Head Gasket for Nissan RB25DE/RB25DET 87mm Bore

The Cometic C4318-140 is a high-performance multi-layer steel (MLS) cylinder head gasket designed specifically for Nissan RB25DE and RB25DET inline-six engines. Engineered for demanding applications including turbocharged and high-boost builds, this gasket provides superior sealing and durability compared to traditional composite gaskets.

Key Specifications:

• Bore size: 87mm (3.425 inches)
• Compressed thickness: .140 inches (3.56mm)
• Multi-layer steel (MLS) construction for maximum strength
• Designed for Nissan RB25DE naturally aspirated and RB25DET turbocharged engines
• Suitable for high-compression and boosted applications

Features and Benefits:

• MLS construction provides excellent torque retention and reusability
• Superior combustion chamber sealing under extreme pressures and temperatures
• Precise embossments around combustion chambers, oil passages, and coolant ports
• Stainless steel construction resists corrosion and chemical degradation
• Accommodates minor surface imperfections for reliable sealing

Cometic's MLS gaskets are the preferred choice for performance and racing applications where reliability is critical. Proper surface preparation (RA finish of 50-60 micro-inches recommended) and torque specifications are essential for optimal performance.