Cometic C5817-086 GM Big Block MLS Head Gasket Bore - V8 4.320

The Cometic C5817-086 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM Generation V and Generation VI big block V8 engines. This precision gasket features a 4.320-inch bore diameter and a compressed thickness of .086 inches, providing optimal sealing and durability for performance and racing applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior strength and heat resistance
• 4.320-inch bore diameter designed for GM big block V8 engines
• .086-inch compressed gasket thickness
• Compatible with Generation V and Generation VI big block platforms
• Engineered to withstand extreme cylinder pressures and temperatures
• Precision-cut for accurate fitment and reliable sealing
• Ideal for performance rebuilds, racing engines, and high-boost applications

Cometic's MLS gaskets utilize multiple layers of stainless steel with proprietary coatings to create a gasket that conforms to irregular surfaces while maintaining superior tensile strength. The embossed layers provide multiple sealing points that resist combustion leaks, coolant seepage, and oil migration even under extreme conditions. This gasket is designed for enthusiasts and professionals who demand maximum reliability from their big block GM powerplants.