Cometic C5641-027 MLS Cylinder Head Gasket GM Mercury Marine Gen-IV Big Block

The Cometic C5641-027 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM and Mercury Marine Gen-IV Big Block V8 engines with a 1050 cubic inch displacement. This precision-manufactured gasket features Cometic's proven MLS technology for superior sealing and durability in demanding marine and high-performance applications.

Key Specifications:

• Compressed thickness: 0.027 inches for precise deck height control
• Bore size: 4.600 inches to accommodate big bore applications
• Multi-Layer Steel construction for maximum sealing reliability
• Includes two slotted lifter valley bolt holes for proper oil management
• Compatible with GM and Mercury Marine Gen-IV Big Block V8 engines

Cometic's MLS head gaskets utilize multiple layers of stainless steel with a Viton rubber coating to create a superior seal that can withstand extreme cylinder pressures and temperatures. The gasket's ability to micro-seal imperfections in the sealing surface makes it ideal for both stock and high-performance builds. The precise 0.027-inch thickness allows engine builders to fine-tune compression ratios and deck clearances for optimal performance.

Designed for professional engine builders and serious enthusiasts, this gasket is a direct replacement that provides OE fit with enhanced performance characteristics. The slotted lifter valley bolt design ensures proper gasket retention and oil control in the critical valley area.