Cometic C5403-051 MLS Cylinder Head Gasket Bore Chevy Small Block - 4.200 051

The Cometic C5403-051 is a Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Gen-1 Small Block V8 engines with aftermarket cylinder heads. This precision gasket features a 4.200-inch bore diameter and .051-inch compressed thickness, providing exceptional sealing performance for modified engines.

Key Features:

• Multi-Layer Steel construction for superior durability and heat resistance
• 4.200" bore diameter accommodates standard and slightly overbored applications
• .051" compressed thickness (51 thousandths) for optimal compression control
• Undersized water ports allow for custom porting and coolant flow optimization
• Designed for aftermarket cylinder heads with non-standard port configurations
• Engineered for high-performance and racing applications

Cometic's MLS gaskets utilize multiple layers of stainless steel with embossed sealing beads that maintain constant contact pressure across the entire sealing surface. The undersized water ports give engine builders the flexibility to match coolant passages precisely to their specific cylinder head and block combination, ensuring proper flow without compromising gasket integrity. Ideal for street performance, drag racing, and road racing builds where precise sealing and customization are critical.