Cometic C5638-070 GM/Mercury Marine Gen-IV Big Block MLS Cylinder Head Gasket - V8 070

The Cometic C5638-070 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM and Mercury Marine 1050 Gen-IV big block V8 engines. This precision gasket features a .070" compressed thickness and is designed for a 4.500" bore diameter, providing superior sealing capabilities for high-performance and marine applications.

Key Features:

• Multi-Layer Steel (MLS) construction for exceptional durability and heat resistance
• .070" compressed gasket thickness for optimal compression ratio tuning
• 4.500" bore diameter designed for Gen-IV big block applications
• Includes two slotted lifter valley bolt holes for proper installation
• Marine-grade design suitable for GM and Mercury Marine 1050 Gen-IV engines
• Superior conformability to cylinder head and block surfaces

Cometic's MLS gaskets utilize multiple layers of stainless steel with precision-engineered sealing beads to create maximum sealing pressure at critical areas. This design allows the gasket to recover and maintain seal integrity under extreme thermal cycling and combustion pressures, making it ideal for both high-performance street engines and demanding marine environments.