Cometic C5639-075 GM Mercury Marine Gen-IV Big Block MLS Cylinder Head Gasket - V8

The Cometic C5639-075 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM and Mercury Marine Gen-IV 1050 big block V8 engines. This precision-manufactured gasket features a 4.530-inch bore diameter and .075-inch compressed thickness, 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 for proper combustion chamber sealing
• .075-inch (0.075") compressed gasket thickness
• Designed for GM/Mercury Marine Gen-IV 1050 big block V8 engines
• Includes 2 slotted lifter valley bolt holes for secure installation
• Engineered to withstand extreme cylinder pressures and temperatures
• Provides excellent combustion sealing and coolant passage integrity

Cometic's MLS gaskets utilize multiple layers of stainless steel with a Viton rubber coating, allowing them to recover quickly from thermal expansion and contraction cycles. This design makes them ideal for both stock rebuilds and high-performance applications where reliability is critical. The precise bore sizing and thickness specifications ensure proper compression ratios and consistent performance in demanding marine environments.