Cometic C5271-040 MLS Cylinder Head Gasket Chevy Small Block Bore - for V8 4.125

The Cometic C5271-040 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 .040" compressed thickness and is designed to accommodate a 4.125" bore diameter, making it ideal for both stock and modified engines.

Key Features:

• Multi-Layer Steel construction provides superior sealing and durability under extreme combustion pressures
• .040" compressed gasket thickness for precise deck height management
• 4.125" bore diameter fits standard and slightly overbored small block Chevy engines
• Valve pocketed bore design provides clearance for larger valves in performance cylinder heads
• Compatible with both 18-degree and 23-degree aftermarket cylinder heads
• Steam hole configuration ensures proper coolant flow and engine temperature management
• Eliminates the need for sealants or re-torquing after installation

Cometic MLS gaskets feature multiple layers of stainless steel with a Viton rubber coating that maintains torque retention and provides excellent resistance to temperature and chemical degradation. This gasket is an excellent choice for street performance, racing, and high-boost forced induction applications where reliable head sealing is critical.