Cometic C5639-098 MLS Cylinder Head Gasket GM Mercury Marine Gen-IV Big Block 4.530 Bore

The Cometic C5639-098 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM and Mercury Marine 1050 Gen-IV big block V8 marine engines. Designed to deliver maximum sealing performance in demanding marine environments, this gasket features a .098 inch compressed thickness and a 4.530 inch bore diameter.

Key Features:

• Multi-layer stainless steel construction provides exceptional strength, rebound characteristics, and corrosion resistance
• Embossed outer layers coated with Viton rubber on both sides for superior sealing in harsh marine conditions
• Heat resistant to 482°F (250°C) for reliable performance under extreme temperatures
• Designed for 2-bolt intake side configuration with slotted lifter valley bolts
• Promotes even clamp load distribution across sealing surface for reduced bore distortion
• No retorque required after installation
• Install dry - pre-coated with sealant for optimal performance

This precision-engineered gasket is manufactured in the USA from American-sourced materials and is designed to meet the specific demands of high-output marine engine applications. The MLS design conforms to irregular surfaces while maintaining superior sealing integrity against combustion gases, oil, and coolant.