Cometic C5271-045 MLS Cylinder Head Gasket Chevy Small Block Bore - for V8 4.125

The Cometic C5271-045 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Generation 1 Small Block V8 engines. This precision-manufactured gasket features a compressed thickness of .045 inches and accommodates a 4.125-inch bore diameter, making it ideal for performance and racing applications where reliability under extreme conditions is critical.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under high cylinder pressures and temperatures
• 4.125" bore diameter accommodates stock and slightly overbored small block Chevy engines
• .045" compressed gasket thickness allows for precise compression ratio tuning
• Designed for 18-degree and 23-degree cylinder heads with valve pocketed bore design
• Steam hole configuration ensures proper coolant circulation
• Embossed stainless steel layers with elastomeric coating for maximum conformability

Cometic MLS gaskets are the choice of professional engine builders and racers worldwide. The multi-layer design distributes clamping load evenly while maintaining flexibility to compensate for minor surface imperfections. Compatible with Chevrolet small block engines including 283, 302, 305, 307, 327, 350, and 400 cubic inch variants when equipped with compatible cylinder heads. Proper surface preparation with RA finish of 50-60 microinches is recommended for optimal sealing performance.