Cometic C5249-120 MLS Cylinder Head Gasket Chevy Small Block Bore - for V8 4.200

The Cometic C5249-120 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Generation 1 Small Block V8 engines. This precision gasket features a .120" compressed thickness and is designed for 4.200" bore applications with 18 or 23 degree cylinder heads.

Key Specifications:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• .120" (3.0mm) compressed gasket thickness
• 4.200" bore diameter with round bore design
• Compatible with 18/23 degree cylinder heads
• Includes steam holes for proper coolant circulation
• Engineered for high-performance and racing applications

Cometic's MLS head gaskets feature multiple layers of stainless steel with proprietary coatings that provide exceptional resistance to combustion pressure, coolant, and oil. The embossed stainless steel layers create a micro seal around combustion chambers, coolant passages, and oil return holes. This gasket is ideal for modified engines with increased compression ratios or boost applications where OEM-style gaskets may not provide adequate sealing. The .120" thickness allows for precise compression ratio tuning in stroker or high-compression builds.

Cometic recommends using proper surface preparation and torque specifications for optimal performance. Cylinder head and block surfaces should be flat within .002" and have a surface finish of 50-60 RA for MLS gaskets.