COMETIC Top End Gasket - Twin Cam - 4-1/8" C9976

If you're rebuilding a Twin Cam top end, a failed gasket can cost you serious downtime and money. The COMETIC C9976 eliminates guesswork by delivering a complete, precision-engineered gasket kit with proven heat management technology—so you seal it right the first time and focus on performance, not repairs.

Built with EST (Extreme Sealing Technology), this kit features embossed stainless steel gaskets paired with proprietary rubber facing that actively draws heat away from the combustion ring. The result is even thermal distribution across the gasket surface, which kills hot spots and the premature failures they cause. Whether you're a racer maintaining peak reliability or a builder going for a bulletproof assembly, this kit gives you the engineering and materials to back it up.

• EST technology gasket kit
• Embossed stainless steel construction
• Proprietary rubber material facing
• Superior heat dissipation design
• Eliminates hot spots
• Complete top-end rebuild set
• All gaskets, seals, O-rings included
• Twin Cam application
• 4-1/8" bore specification
• Made in the U.S.A.
• Bolt-on installation
• Professional-grade reliability