Cometic C5249-051 MLS Cylinder Head Gasket Small Block Chevy Bore - 4.200 051

The Cometic C5249-051 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Generation I small block V8 engines. This precision-manufactured gasket features a .051-inch compressed thickness and is designed for 4.200-inch bore applications with 18 or 23 degree cylinder heads.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme conditions
• 4.200-inch bore diameter accommodates stroker and overbored applications
• .051-inch compressed thickness allows for precise compression ratio tuning
• Compatible with 18-degree and 23-degree aftermarket cylinder heads
• Round bore design with integrated steam holes for proper coolant circulation
• Embossed stainless steel layers with elastomer coating ensure excellent sealing

Cometic MLS gaskets are the preferred choice for high-performance and racing applications where conventional composite gaskets cannot withstand elevated cylinder pressures and temperatures. The multi-layer design allows the gasket to compensate for minor surface imperfections while maintaining consistent clamping pressure across the entire sealing surface. This gasket is ideal for boosted applications, nitrous oxide systems, and naturally aspirated engines with compression ratios exceeding stock specifications.

Application Note: Designed for Chevrolet Gen-1 small block V8 engines (262-400 cubic inches) with aftermarket cylinder heads featuring 18 or 23 degree valve angles. Requires proper surface preparation with RA finish between 50-60 for optimal sealing performance.