Cometic C5638-056 GM/Mercury Marine Gen-IV MLS Cylinder Head Gasket Bore - 4.500

The Cometic C5638-056 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 4.500-inch bore diameter. This precision gasket is designed to handle the extreme pressures and temperatures found in high-performance marine and automotive applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• .056-inch (1.42mm) compressed thickness for optimal compression ratio control
• 4.500-inch bore diameter specifically sized for Gen-IV big block applications
• Includes two slotted lifter valley bolt holes for proper oiling system integration
• Advanced coating technology ensures consistent clamping load and prevents corrosion
• Compatible with both GM performance and Mercury Marine 1050 Gen-IV engines

Cometic's MLS gaskets feature multiple layers of stainless steel with active sealing technology that responds to cylinder pressure and engine movement. The embossed layers create a superior seal around combustion chambers, coolant passages, and oil galleries. This gasket is ideal for marine applications where saltwater exposure and demanding operating conditions require the ultimate in reliability and longevity.