Cometic C5817-066 GM Gen V/VI Big Block MLS Cylinder Head Gasket Bore - V8 4.320

The Cometic C5817-066 is a premium multi-layer steel (MLS) cylinder head gasket engineered 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 .066-inch compressed thickness, providing an optimal seal between the cylinder head and engine block.

Key Features:

• Multi-layer steel construction for superior sealing and durability
• 4.320-inch bore diameter for precise fitment
• .066-inch (66 thousandths) compressed gasket thickness
• Designed for GM Gen V and Gen VI big block V8 applications
• Handles high cylinder pressures and extreme temperatures
• Embossed stainless steel outer layers with elastomer coating

Cometic MLS gaskets are trusted by professional engine builders and enthusiasts for their ability to withstand the demands of high-performance and racing applications. The multi-layer design allows the gasket to adapt to minor surface imperfections while maintaining consistent clamping pressure across the entire sealing surface. Ideal for performance rebuilds, forced induction setups, and high-compression naturally aspirated engines.