Cometic C5639-056 GM/Mercury Marine Gen-IV Big Block MLS Cylinder Head Gasket - V8

The Cometic C5639-056 is a premium 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 gasket features a .056-inch compressed thickness and is designed to accommodate a 4.530-inch bore diameter, making it ideal for high-performance marine and automotive applications.

Key Features:

• Multi-layer steel construction for superior sealing and durability under extreme conditions
• .056-inch compressed thickness optimized for performance builds
• 4.530-inch bore diameter for proper combustion chamber sealing
• Includes two slotted lifter valley bolt provisions for secure installation
• Application-specific design for GM/Mercury Marine Gen-IV 1050 big block V8 engines
• Manufactured by Cometic using precision die-cutting and advanced gasket materials

Cometic's MLS gaskets provide exceptional resistance to extreme temperatures and cylinder pressures, making them the preferred choice for marine performance engines, racing applications, and high-output street builds. The multi-layer design allows for controlled compression while maintaining consistent clamping loads across the entire sealing surface.