Cometic C5271-066 MLS Cylinder Head Gasket Chevy SBC Bore Thick - 4.125 066

The Cometic C5271-066 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Generation 1 Small Block V8 engines. This high-performance gasket features a 4.125-inch bore diameter and .066-inch thickness, making it ideal for engines with increased compression or forced induction applications.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme cylinder pressures
• 4.125-inch bore diameter accommodates stock and slightly overbored small block Chevy engines
• .066-inch compressed thickness allows for precise compression ratio tuning
• Designed for 18-degree and 23-degree aftermarket cylinder heads
• Valve pocketed bore design provides clearance for larger valves in performance heads
• Integrated steam holes for proper coolant circulation
• Compatible with Gen-1 Small Block Chevy engines (262-400 cubic inches)

Cometic MLS gaskets utilize multiple layers of stainless steel with a Viton rubber coating, offering exceptional resistance to blowout and superior reusability compared to traditional composite gaskets. The embossed sealing beads ensure consistent clamping pressure across the entire sealing surface, making this gasket an excellent choice for high-performance street engines, bracket racing applications, and forced induction builds.