Cometic C5433-140 MLS Head Gasket for Chevy Big Block 4.570 Bore .140 Thick

The Cometic C5433-140 is a Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines. This precision-manufactured gasket features a .140-inch compressed thickness and a 4.570-inch bore diameter, making it ideal for performance and racing applications where exact bore sizing is critical.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• 4.570-inch bore diameter for precise fitment
• .140-inch (3.56mm) compressed gasket thickness
• Designed for aftermarket cylinder heads
• Undersized water ports allow for custom porting and machining
• Compatible with Chevrolet Mark-IV, GM Gen-V, and Gen-VI Big Block V8 engines

Cometic's MLS technology uses multiple layers of stainless steel with advanced coating materials to provide maximum sealing performance under extreme cylinder pressures and temperatures. The undersized water ports give engine builders the flexibility to match-port the gasket to specific cylinder head designs, ensuring optimal coolant flow and eliminating potential leak paths. This gasket is particularly well-suited for high-compression, forced induction, and nitrous applications where conventional gaskets may fail.