Cometic C9769-030 EST Top End Gasket Kit 3.813" Big Bore 1984-1991 Evolution Big Twin .030" Head Gasket

The Cometic C9769-030 is a complete EST (Extreme Sealing Technology) top end gasket kit designed for big bore 1984-1991 Harley-Davidson Evolution Big Twin engines with a 3.813" (3 13/16") bore. This comprehensive rebuild kit features a .030" thick Multi-Layer Steel (MLS) head gasket and includes all necessary gaskets, seals, and O-rings to rebuild the top end from the cylinder base upward.

EST Technology Features:

• Embossed stainless steel head, base, and rocker gaskets covered with proprietary rubber material
• MLS head gasket construction draws heat away from the combustion ring and dissipates it evenly across the gasket surface to eliminate hot spots and gasket failure
• Steel Viton-coated base gaskets for superior sealing under high-temperature conditions
• Blue Viton valve stem seals for precise oil control
• AFM (Aluminum Fiber Material) gaskets for enhanced durability
• Race-style exhaust gaskets that won't fray into the port

Designed for performance builds and big bore applications, this kit provides the advanced sealing technology needed to handle increased compression and heat. All Cometic gaskets are proudly manufactured in the USA with premium materials engineered for maximum reliability and performance.