Cometic C9690-045 MLS Cylinder Head Gasket Bore Thick - 3.625 045

The Cometic C9690-045 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered for Harley-Davidson Evolution Big Twin and Sportster engines with 3.625-inch big bore cylinders. This high-performance gasket features advanced construction designed to handle the demanding conditions of modern V-twin engines.

Key Features:

• Multi-layer stainless steel construction with three layers for superior sealing and strength
• Outer layers embossed and coated on both sides with Viton (fluoroelastomer) for heat resistance up to 482°F
• Center shim layer is uncoated stainless steel for precise thickness requirements
• Load Control Embossments (LCE) promote even torque distribution across the sealing surface
• Reduces bore distortion and improves piston ring seal for increased power output
• Excellent rebound characteristics and corrosion resistance
• 3.625-inch bore diameter, .045-inch compressed thickness
• Sold as a pair for both cylinders
• Made in the USA

Cometic MLS gaskets are ideal for aluminum heads on cast iron blocks, aluminum-to-aluminum applications, and performance builds. The advanced design handles the shearing forces between dissimilar materials while maintaining a reliable seal in harsh sealing environments. No additional sealants required when installed on properly prepared surfaces.