Cometic C15529-040 MLS Cylinder Head Gasket Chevy Big Block Mark IV Bore - 4.500

The Cometic C15529-040 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet Mark IV Big Block V8 engines. This precision gasket features a .040" compressed thickness and is designed for 4.500" bore applications, making it ideal for stroker motors and high-compression builds.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme cylinder pressures
• .040" compressed thickness allows for precise compression ratio tuning
• 4.500" bore diameter accommodates oversized pistons in stroker and performance builds
• Valve pocketed bores provide clearance for larger valves and prevent interference
• Stainless steel construction with Viton rubber coating ensures excellent heat resistance and chemical compatibility
• Designed to handle the demanding conditions of high-performance and racing applications

Cometic MLS head gaskets are manufactured using multiple layers of stainless steel with a Viton rubber outer coating, creating a gasket that can withstand extreme temperatures and pressures while maintaining a perfect seal. The valve pocketed design makes this gasket compatible with performance cylinder heads featuring larger valve sizes. Proper surface preparation (RA finish of 50-60 micro-inches) is recommended for optimal sealing performance.