Cometic C5638-120 MLS Cylinder Head Gasket GM Mercury Marine Gen-IV Big Block - V8

The Cometic C5638-120 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 precision-manufactured gasket features Cometic's proven MLS construction for superior sealing and durability in high-performance marine and automotive applications.

Key Specifications:

• Bore size: 4.500 inches
• Gasket thickness: .120 inches (compressed)
• Multi-layer steel (MLS) construction for maximum strength and heat resistance
• Includes provisions for 2 slotted lifter valley bolts
• Designed for Gen-IV GM big block architecture

Features and Benefits:

• MLS construction provides multiple layers of stainless steel with elastomeric coatings for superior combustion sealing
• Eliminates the need for additional sealants in most applications
• Excellent thermal resistance and recovery properties handle extreme cylinder pressure
• Reusable design for engine builders and racers
• Precision machined for consistent compression and perfect sealing

Cometic Gaskets are a trusted choice among professional engine builders, racers, and marine performance enthusiasts. This gasket is ideal for high-compression builds, forced induction applications, and demanding marine environments where reliability is critical.