Cometic C5639-036 GM Mercury Marine Gen IV Big Block V8 Cylinder Head Gasket .036" MLS 4.530" Bore

The Cometic C5639-036 is a premium 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 .036" compressed thickness and is designed for 4.530" bore applications, providing exceptional sealing performance in high-performance marine and automotive environments.

Key Features:

• Multi-layer steel (MLS) construction for superior strength and durability
• .036" compressed thickness for optimal compression ratio control
• 4.530" bore diameter engineered for Gen-IV big block applications
• Includes 2 slotted lifter valley bolt holes for proper valley cover installation
• Compatible with GM and Mercury Marine 1050 Gen-IV V8 engines
• Advanced MLS technology provides excellent combustion sealing and rebound characteristics

Cometic's MLS head gaskets feature multiple layers of stainless steel with elastomeric coatings that conform to minor surface irregularities, ensuring a reliable seal even under extreme cylinder pressures and temperatures. The slotted lifter valley bolt design accommodates proper valley cover mounting for complete engine sealing. Ideal for performance rebuilds, racing applications, and marine engine overhauls.