Cometic C5637-066 MLS Cylinder Head Gasket GM Mercury Marine Gen IV V VI Bore - 4.600

The Cometic C5637-066 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered for GM and Mercury Marine Big Block V8 Gen-IV, Gen-V, and Gen-VI engines. This precision gasket features a .066-inch compressed thickness and is designed for engines with a 4.600-inch bore diameter.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability
• .066-inch (1.68mm) compressed thickness for precise deck height control
• 4.600-inch bore diameter accommodates performance and stroked applications
• Compatible with 4-bolt lifter valley configuration
• Designed specifically for GM/Mercury Marine Big Block V8 Gen-IV, Gen-V, and Gen-VI platforms
• Exceeds OEM specifications for high-performance and marine applications

Cometic's MLS gaskets feature multiple layers of stainless steel with elastomeric coatings that adapt to sealing surface imperfections while maintaining proper combustion seal under extreme temperatures and pressures. The embossed stainless steel layers provide superior rebound characteristics compared to traditional composite gaskets, making them ideal for both marine and high-performance automotive builds.