Cometic C5639-089 GM/Mercury Marine Gen-IV Big Block MLS Cylinder Head Gasket - V8

The Cometic C5639-089 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 premium gasket features a 4.530-inch bore diameter and a compressed thickness of .089 inches, providing exceptional sealing capability for high-performance marine and automotive applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior strength and durability
• 4.530-inch bore diameter designed for Gen-IV Big Block V8 engines
• .089-inch compressed thickness for optimal sealing
• Includes two slotted lifter valley bolts for complete installation
• Engineered for GM 1050 cubic inch and Mercury Marine Gen-IV applications
• Cometic's MLS technology provides exceptional resistance to blowout and gasket failure

Cometic's MLS gaskets utilize multiple layers of stainless steel with proprietary coatings to ensure maximum sealing performance under extreme cylinder pressures and temperatures. The embossed sealing beads create a precise seal around combustion chambers, coolant passages, and oil galleries. This gasket is ideal for high-performance street, marine racing, and offshore applications where reliability is critical.