Cometic C5434-056 MLS Cylinder Head Gasket Big Block Chevy Bore - 4.630 056

The Cometic C5434-056 is a high-performance multi-layer steel (MLS) cylinder head gasket engineered for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines. Featuring a 4.630-inch bore diameter and .056-inch compressed thickness, this gasket is designed for use with aftermarket cylinder heads requiring precise sealing and customization capabilities.

Key Features:

• Multi-layer steel (MLS) construction provides superior sealing and durability under extreme cylinder pressures and temperatures
• 4.630-inch bore diameter accommodates performance big block builds
• .056-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports enable custom port matching to aftermarket cylinder heads for optimized coolant flow
• Compatible with Chevrolet Mark-IV, GM Gen-V, and Gen-VI Big Block V8 engines
• Engineered for aftermarket performance heads where customization is required

Cometic MLS gaskets feature multiple layers of stainless steel with elastomeric coatings that conform to surface imperfections while maintaining consistent clamping pressure. The undersized water ports on this gasket allow engine builders to match-port the gasket to specific aftermarket cylinder heads, ensuring proper coolant circulation and eliminating potential leak paths. Ideal for high-performance street engines, race applications, and custom engine builds requiring precise fitment and reliable sealing.