Cometic C5640-098 MLS Cylinder Head Gasket GM/Mercury Marine Gen-IV Big Block

The Cometic C5640-098 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM and Mercury Marine Gen-IV Big Block V8 applications with a 1050 cubic inch displacement. This precision-manufactured gasket features Cometic's renowned MLS construction for superior sealing performance under extreme combustion pressures and temperatures.

Key Specifications:

• Gasket thickness: 0.098 inches (98 thousandths)
• Bore size: 4.580 inches
• Multi-Layer Steel (MLS) construction for maximum durability
• Includes 2 slotted lifter valley bolt holes
• Designed for GM/Mercury Marine Gen-IV Big Block V8 engines
• Compatible with 1050 cubic inch displacement engines

Advanced MLS Technology:

Cometic's MLS gaskets feature multiple layers of stainless steel with elastomeric coatings that provide exceptional recovery and conform to sealing surfaces. This design allows the gasket to maintain seal integrity through thermal expansion and contraction cycles, making it ideal for high-performance and marine applications where reliability is critical.

What's Included:

Single cylinder head gasket with integrated slotted lifter valley bolt provisions. Sold individually—order quantity needed for your engine build.

This gasket is precision-engineered for demanding marine and performance applications where standard composite gaskets cannot withstand the operating conditions. The 4.580-inch bore accommodates larger displacement builds while the 0.098-inch thickness allows for precise compression ratio tuning.