Cometic C5638-030 GM Mercury Marine Gen-IV Big Block V8 Cylinder Head Gasket .030" MLS

The Cometic C5638-030 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered for GM and Mercury Marine Gen-IV big block V8 applications with a 1050 cubic inch displacement. This precision-manufactured gasket features a 4.500-inch bore diameter and a compressed thickness of .030 inches, making it ideal for high-compression builds and marine engine applications where superior sealing is critical.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme heat and pressure
• 4.500-inch bore diameter designed specifically for Gen-IV big block V8 engines
• .030-inch compressed thickness for precise deck height control
• Includes two slotted lifter valley bolt holes for proper installation
• Engineered for both GM automotive and Mercury Marine applications
• MLS design allows for slight movement and thermal expansion while maintaining seal integrity
• Compatible with 1050 cubic inch Gen-IV big block V8 configurations

Cometic's MLS gaskets are constructed with multiple layers of stainless steel, providing the ability to withstand extreme cylinder pressures and temperatures. The embossed bead design ensures consistent clamping pressure around combustion chambers, coolant passages, and oil galleries. This gasket is ideal for performance marine engines, racing applications, and high-output street builds where reliability and sealing performance are paramount.