Cometic C5640-070 GM/Mercury Marine Gen-IV Big Block MLS Cylinder Head Gasket - V8

The Cometic C5640-070 is a 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 .070-inch compressed thickness and a 4.580-inch bore diameter, providing exceptional sealing performance in high-performance marine and automotive applications.

Key Features:

• Multi-layer steel (MLS) construction for superior strength and durability
• .070-inch compressed thickness for optimal compression and sealing
• 4.580-inch bore diameter designed for Gen-IV big block engines
• Includes two slotted lifter valley bolt provisions for proper installation
• Engineered for both GM automotive and Mercury Marine applications
• MLS design accommodates thermal expansion and engine movement

Cometic's MLS gaskets utilize multiple layers of stainless steel with specialized coatings to create a superior seal that withstands extreme cylinder pressures and temperatures. The embossed layers provide multiple sealing points around combustion chambers, coolant passages, and oil galleries. This gasket is ideal for high-performance builds, forced induction applications, and marine environments where reliability is critical.