Cometic C5817-056 GM Gen V/VI Big Block MLS Head Gasket Bore - V8 4.320

The Cometic C5817-056 is a precision-engineered Multi-Layer Steel (MLS) cylinder head gasket designed specifically for GM Generation V and Generation VI Big Block V8 engines. This high-performance gasket features a 4.320-inch bore diameter and a compressed thickness of .056 inches, providing an optimal seal between the cylinder head and engine block.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• 4.320-inch bore diameter for precise fitment
• .056-inch compressed gasket thickness
• Engineered for GM Gen V and Gen VI Big Block V8 applications
• Resists extreme temperatures and combustion pressure
• Allows for thermal expansion and contraction without compromising seal integrity

Cometic's MLS gaskets feature multiple layers of stainless steel with specialized coatings that provide excellent rebound characteristics and conform to sealing surfaces even under high-stress conditions. This gasket is ideal for performance builds, engine rebuilds, and high-compression applications where reliability is critical.