Cometic C5639-092 GM Mercury Marine Gen-IV Big Block V8 Cylinder Head Gasket

The Cometic C5639-092 is a premium 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 high-performance gasket features a .092-inch (2.34mm) compressed thickness and is precision-manufactured to provide superior sealing and durability in demanding marine and high-performance applications.

Key Features:

• Multi-layer steel (MLS) construction for maximum strength and reliability
• 4.530-inch bore diameter designed for Gen-IV big block applications
• .092-inch compressed gasket thickness
• Includes two slotted lifter valley bolt holes for proper installation
• Engineered for GM and Mercury Marine 1050 Gen-IV engines
• Superior sealing properties resist combustion leaks and coolant migration
• Accommodates thermal expansion and contraction in high-heat environments

Cometic's MLS gaskets utilize multiple layers of stainless steel with advanced coating technology to create a gasket that conforms to irregular sealing surfaces while maintaining structural integrity. The embossed layers provide multiple sealing points around combustion chambers, coolant passages, and oil galleries. Ideal for stock rebuilds, performance upgrades, and marine applications where reliability is critical.