Cometic C5434-066 MLS Cylinder Head Gasket Bore Big Block Chevy - 4.630

The Cometic C5434-066 is a precision-engineered Multi-Layer Steel (MLS) cylinder head gasket designed specifically for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines. This gasket features a 4.630-inch bore diameter and a compressed thickness of .066 inches, providing exceptional sealing performance for high-performance and racing applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior durability and heat resistance
• 4.630-inch bore diameter accommodates various big block configurations
• .066-inch compressed thickness allows for precise compression ratio tuning
• Undersized water ports designed for aftermarket cylinder heads, enabling custom port matching and optimization
• Compatible with Chevrolet Mark-IV, GM Gen-V, and Gen-VI Big Block V8 engines
• High-quality materials resist combustion pressures and thermal cycling

This gasket is ideal for engine builders and performance enthusiasts who demand reliable sealing in high-stress applications. The undersized water ports provide the flexibility to machine and customize water passages to match specific aftermarket cylinder head designs, ensuring optimal coolant flow and engine performance.