Cometic C9689-054 MLS Head Gasket Set Harley Evolution Bore Thick - 3.500 054 2-Pack

The Cometic C9689-054 is a premium Multi-Layer Steel (MLS) head gasket set designed for Harley-Davidson Evolution engines with stock 3.500-inch cylinder bore. This 2-pack includes gaskets featuring Cometic's advanced MLS-5 construction with five layers of stainless steel, providing superior sealing performance and durability in high-performance applications.

Key Specifications:

• Bore size: 3.500 inches (stock Evolution bore)
• Compressed thickness: .054 inches
• MLS-5 construction with five layers of stainless steel
• Includes 2 head gaskets (one pair)
• Designed for Harley-Davidson Evolution Big Twin engines

Features and Benefits:

• Multi-Layer Steel construction provides exceptional strength and elasticity to seal irregular surfaces
• Superior resistance to extreme temperatures and cylinder pressures
• Eliminates the need for retorquing after initial installation
• Reusable design allows for multiple installations when properly maintained
• Embossed stainless steel layers with specialized coatings ensure optimal sealing

Cometic MLS head gaskets are the industry standard for serious builders and racers who demand maximum reliability. The multi-layer design compensates for head and deck surface imperfections while maintaining consistent clamping pressure across the entire sealing surface, making them ideal for both stock rebuilds and high-performance applications.