Cometic C9689-051 HD EVO Stock Bore Head Gasket MLS - 3.500 051 2-Pack

The Cometic C9689-051 is a premium Multi-Layer Steel (MLS) head gasket set designed specifically for Harley-Davidson Evolution engines with stock 3.500" bore. This 2-pack includes a pair of .051" thick head gaskets engineered to provide superior sealing performance under high compression and extreme operating conditions.

Key Features:

• Multi-Layer Steel construction for maximum durability and heat resistance
• Stock bore size of 3.500" for Evolution Big Twin engines
• .051" (1.30mm) compressed thickness for precise compression control
• Stainless steel material resists corrosion and maintains integrity under extreme temperatures
• Includes 2 head gaskets for complete top-end service
• Advanced MLS technology provides superior sealing at cylinder head interface
• Designed to handle high horsepower and boost applications

Cometic MLS head gaskets feature multiple layers of stainless steel with embossed sealing beads that adapt to surface irregularities, ensuring a leak-free seal. The flexible design accommodates thermal expansion and engine movement while maintaining consistent clamping pressure. Ideal for stock rebuilds or performance applications on Harley-Davidson Evolution V-Twin engines.