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Start ShoppingCometic C9222 Twin Cam EST Gasket Kit - 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 C9222 EST gasket kit. Engineered for high-performance durability, this MLS head gasket kit ensures optimal sealing and long-term power delivery for riders demanding precision and strength.
Key Features
- Multi-Layer Steel (MLS) Head Gaskets: Superior sealing technology for enhanced engine efficiency and reduced overheating risks.
- Premium Fiber/Composite Materials: Resists warping and degradation under extreme temperatures and pressures.
- USA-Made Craftsmanship: Precision-engineered in American manufacturing facilities for unmatched quality standards.
- EST Top-End Compatibility: Specifically designed for Harley-Davidson Twin Cam EST engines (1999-2006 models).
Why Choose This Product
Cometic's Twin Cam EST gasket kit delivers factory-level performance with advanced materials that outlast standard gaskets. The MLS design prevents head gasket failure in high-output engines, while the premium composite materials withstand thermal cycling and oil contamination. This kit is essential for riders who demand consistent power delivery and long-term engine reliability without compromising performance. Perfect for both engine rebuilds and maintenance upgrades, Cometic's C9222 ensures your Harley's top-end components operate at peak efficiency.
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Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9222 EST gasket kit. Engineered for high-performance durability, this MLS head gasket kit ensures optimal sealing and long-term power delivery for riders demanding precision and strength.
Key Features
- Multi-Layer Steel (MLS) Head Gaskets: Superior sealing technology for enhanced engine efficiency and reduced overheating risks.
- Premium Fiber/Composite Materials: Resists warping and degradation under extreme temperatures and pressures.
- USA-Made Craftsmanship: Precision-engineered in American manufacturing facilities for unmatched quality standards.
- EST Top-End Compatibility: Specifically designed for Harley-Davidson Twin Cam EST engines (1999-2006 models).
Why Choose This Product
Cometic's Twin Cam EST gasket kit delivers factory-level performance with advanced materials that outlast standard gaskets. The MLS design prevents head gasket failure in high-output engines, while the premium composite materials withstand thermal cycling and oil contamination. This kit is essential for riders who demand consistent power delivery and long-term engine reliability without compromising performance. Perfect for both engine rebuilds and maintenance upgrades, Cometic's C9222 ensures your Harley's top-end components operate at peak efficiency.| SKU | GM81E17894 |
|---|---|
| MPN | C9222 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Twin Cam 88 applications | 1999-2006 |
Frequently Asked Questions
No. It is intended for specific Harley‑Davidson Twin Cam applications and years. Always verify coverage in Cometic’s official catalog or your distributor’s fitment guide for part C9222 before ordering.
It is described as an EST (engine service / top end–style) gasket kit, but contents can vary by part number. Check the kit contents list or product photo from your distributor to confirm which gaskets (head, base, rocker box, intake, etc.) are included.
No. Cometic and Harley‑Davidson both recommend replacing head and most critical engine gaskets any time the joint is opened to ensure proper sealing.
Typically, Cometic MLS head gaskets are installed dry, and other gaskets are installed according to the Harley‑Davidson service manual. Only use sealant where the manual or Cometic instructions explicitly call for it.
On most Twin Cam models, top‑end service with a kit like this can be done in‑frame, but clearances can be tight. Refer to the factory service manual procedures for your specific model.
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- Harley-Davidson service manual for the specific Twin Cam model
- Standard and metric socket set
- Allen/hex keys
- Torque wrench (inch‑lb and ft‑lb)
- Breaker bar
- Feeler gauges
- Scraper or plastic razor blades for gasket surfaces
- Brake cleaner or gasket-surface cleaner
- Thread locker (as specified by service manual)
- Engine assembly lube
- Straightedge for checking head and cylinder deck flatness
- Shop rags
Pro Tips
- Always consult the Harley-Davidson service manual for your exact model and follow the torque specs and tightening sequence precisely.
- Dry-fit each gasket to confirm orientation and that all oil passages and bolt holes line up before applying final torque.
- Use a non-abrasive method to remove old gasket material to avoid gouging aluminum surfaces.
- Check head and cylinder deck surfaces for warpage with a straightedge; machine if out of spec.
- Allow adequate cool-down and recheck for leaks after the first heat cycles; inspect for any oil seepage around head and rocker box gaskets.
Common Mistakes to Avoid
- Failing to follow the exact torque sequence and torque values for head bolts and rocker box fasteners
- Reusing old or damaged fasteners when they should be replaced
- Not thoroughly cleaning gasket surfaces, leading to leaks
- Using abrasive discs that can damage aluminum surfaces or leave debris in the engine
- Installing gaskets upside down or misaligned with oil and coolant passages
- Skipping flatness checks on heads and cylinders before installation
Comparison vs Stock/OEM
Cometic gaskets are widely used in performance and race applications and are often considered an upgrade over OEM Harley‑Davidson gaskets, especially in high‑compression or high‑temperature conditions.
Improvements
- Multi‑layer steel (MLS) head gaskets typically provide improved sealing on high‑compression and performance builds.
- High‑quality materials and tighter manufacturing tolerances compared to many OEM and aftermarket gasket sets.
- Better resistance to heat cycling and long‑term sealing in Twin Cam engines.
Considerations
- Correct surface finish and flatness are more important with MLS gaskets; poor preparation can lead to sealing issues.
- Always confirm gasket thickness and compression compatibility with your engine build before installation.
Durability & Warranty
Expected Lifespan
Designed for OEM‑equivalent or better service life when installed on properly prepared surfaces and operated within normal temperature and compression ranges.
Warranty
Cometic typically offers a limited warranty against defects in materials and workmanship; terms vary by distributor and region.
Maintenance
No routine maintenance of the gaskets themselves; periodically inspect for oil seepage around heads, rocker boxes, and cylinder bases during regular service intervals.
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