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Start ShoppingCometic C9155 Twin Cam EST Gasket Kit - Premium MLS Head Gasket Kit for Harley-Davidson Engines
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Description
Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9155 EST Gasket Kit. This comprehensive top-end repair solution combines premium materials and precise engineering to ensure long-lasting performance and leak-free operation for high-output Twin Cam engines.
Key Features
- Premium Multi-Layer Steel (MLS) Head Gaskets: Advanced MLS construction provides superior sealing under extreme heat and pressure, reducing risk of head gasket failure in high-performance Twin Cam applications.
- Complete Top-End Sealing System: Includes cylinder base gaskets, rocker box seals, cam cover gaskets, and specialized O-rings for all critical oil passage and timing components.
- Harley-Davidson Twin Cam Compatibility: Specifically engineered for 88/95/96/103/110 family engines (verify subvariant compatibility with Cometic catalog).
- Reinforced Rubber and Fiber Coating: Premium fiber and rubber-coated seals offer enhanced durability while maintaining flexibility for proper sealing in dynamic engine environments.
Why Choose This Product
Cometic's EST gasket kit delivers unmatched reliability for Twin Cam engines with its combination of MLS head gaskets, precision-machined seals, and comprehensive coverage. The kit's design addresses common failure points in cam chest and timing systems, ensuring optimal engine performance and longevity. Riders benefit from reduced maintenance intervals and improved engine efficiency, making it an essential upgrade for street and performance applications.
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Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9155 EST Gasket Kit. This comprehensive top-end repair solution combines premium materials and precise engineering to ensure long-lasting performance and leak-free operation for high-output Twin Cam engines.
Key Features
- Premium Multi-Layer Steel (MLS) Head Gaskets: Advanced MLS construction provides superior sealing under extreme heat and pressure, reducing risk of head gasket failure in high-performance Twin Cam applications.
- Complete Top-End Sealing System: Includes cylinder base gaskets, rocker box seals, cam cover gaskets, and specialized O-rings for all critical oil passage and timing components.
- Harley-Davidson Twin Cam Compatibility: Specifically engineered for 88/95/96/103/110 family engines (verify subvariant compatibility with Cometic catalog).
- Reinforced Rubber and Fiber Coating: Premium fiber and rubber-coated seals offer enhanced durability while maintaining flexibility for proper sealing in dynamic engine environments.
Why Choose This Product
Cometic's EST gasket kit delivers unmatched reliability for Twin Cam engines with its combination of MLS head gaskets, precision-machined seals, and comprehensive coverage. The kit's design addresses common failure points in cam chest and timing systems, ensuring optimal engine performance and longevity. Riders benefit from reduced maintenance intervals and improved engine efficiency, making it an essential upgrade for street and performance applications.| SKU | GMB5196DE4 |
|---|---|
| MPN | C9155 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Twin Cam 88-equipped models (Dyna/Softail/Touring) | 1999-2006 |
| Harley-Davidson | Twin Cam 96/103/110-equipped models (Dyna/Softail/Touring) | 2007-2016 |
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- Complete SAE socket and wrench set
- Torque wrench (inch‑lb and ft‑lb) with appropriate ranges for head and rocker fasteners
- Allen/Hex and Torx drivers (Harley-specific fasteners)
- Soft-face hammer and small picks/scrapers for old gasket removal (plastic or brass preferred)
- Razor scraper or gasket remover (used carefully to avoid damaging aluminum surfaces)
- Feeler gauges and straightedge (to check for warped surfaces if necessary)
- Threadlocker (Loctite, as specified by Harley service manual)
- Engine assembly lube (optional but recommended)
- Service manual for torque specs and tightening sequences
Pro Tips
- Always have the Harley-Davidson factory service manual for the exact model you’re working on; follow the torque specs and sequences precisely.
- Dry-fit the kit and lay out each gasket according to location before starting disassembly so you don’t confuse similar pieces.
- Use brake cleaner or a non‑residue solvent and lint‑free rags to get all gasket surfaces spotless and oil‑free before installing MLS head gaskets.
- Chase and clean threaded holes with a tap or thread chaser to ensure accurate torque readings.
- Rotate the engine by hand several revolutions after assembly to confirm smooth valvetrain operation before first fire.
- Perform a careful leak check after first heat cycle and re‑torque any fasteners that the service manual specifies for re‑torque.
Common Mistakes to Avoid
- Not thoroughly cleaning gasket surfaces, leaving old material that causes leaks
- Dry-installing where light oil or specified sealant is required by Harley/Cometic instructions
- Ignoring torque sequence on cylinder heads and rocker boxes
- Over‑torquing MLS head gaskets, which can distort them and compromise sealing
- Reusing old O‑rings or mixing new and old gaskets in the same assembly
- Failing to check pushrod adjustment and valve train geometry after reassembly
Comparison vs Stock/OEM
Cometic Twin Cam EST kits typically use multi-layer steel (MLS) head gaskets and premium sealing materials designed to handle higher cylinder pressures and temperatures compared to many OEM composite gaskets.
Improvements
- MLS head gaskets for improved sealing in high‑compression or performance builds
- High‑quality materials that better resist blow‑out and seepage under hard use
- Comprehensive kit packaging to support a single top‑end/cam chest job
- Reputation in racing and high‑performance Harley builds for reliability
Considerations
- MLS gaskets require very clean, flat surfaces and correct torque procedures; poor prep can negate their benefits.
- Ride quality difference versus OEM is negligible, but improper install can cause leaks.
- Does not include hardware; OEM or upgraded fasteners may still be required.
Durability & Warranty
Expected Lifespan
Comparable to or better than OEM if installed correctly; typically intended to last the life of the top-end build under normal street use.
Warranty
Standard Cometic limited warranty (terms vary by region and distributor; verify at time of purchase).
Maintenance
No ongoing maintenance specific to the gaskets; follow normal engine maintenance. Re‑check for leaks after first few heat cycles and after any major engine work.
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