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Start ShoppingCometic C9149 Twin Cam EST Gasket Kit - High-Performance Engine Gasket Kit for Harley-Davidson
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Description
Upgrade your Harley-Davidson Twin Cam engine's performance and reliability with Cometic's C9149 EST gasket kit. Engineered for precision sealing and long-term durability, this full top-end gasket set is essential for maintaining peak engine efficiency and preventing costly leaks.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing and heat resistance for high-performance engines.
- Comprehensive EST Gasket Kit: Includes all critical top-end gaskets and seals for complete engine service.
- AFM & Fiber Materials: Combines aluminum foam and high-density fiber for enhanced durability and flexibility.
- Harley-Davidson Twin Cam Compatibility: Precision-engineered for fitment on Twin Cam engine applications.
Why Choose This Product
Cometic's C9149 kit delivers unmatched reliability for Twin Cam engines, ensuring proper compression, oil sealing, and coolant management. The use of advanced materials reduces the risk of gasket failure, while the complete kit eliminates the need for multiple purchases. Ideal for riders seeking long-term performance and peace of mind with every engine service.
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Upgrade your Harley-Davidson Twin Cam engine's performance and reliability with Cometic's C9149 EST gasket kit. Engineered for precision sealing and long-term durability, this full top-end gasket set is essential for maintaining peak engine efficiency and preventing costly leaks.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing and heat resistance for high-performance engines.
- Comprehensive EST Gasket Kit: Includes all critical top-end gaskets and seals for complete engine service.
- AFM & Fiber Materials: Combines aluminum foam and high-density fiber for enhanced durability and flexibility.
- Harley-Davidson Twin Cam Compatibility: Precision-engineered for fitment on Twin Cam engine applications.
Why Choose This Product
Cometic's C9149 kit delivers unmatched reliability for Twin Cam engines, ensuring proper compression, oil sealing, and coolant management. The use of advanced materials reduces the risk of gasket failure, while the complete kit eliminates the need for multiple purchases. Ideal for riders seeking long-term performance and peace of mind with every engine service.| SKU | GM3CDAA5F2 |
|---|---|
| MPN | C9149 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Frequently Asked Questions
It is a complete EST (engine service top-end) gasket kit specifically engineered for Harley-Davidson Twin Cam engines. Exact year and model coverage should be verified against the latest Cometic catalog or the motorcycle’s VIN and engine code.
It is a top-end/EST kit and typically includes major top-end gaskets such as head and base gaskets along with rocker box and cover gaskets, but you should confirm the exact contents from the Cometic kit breakdown or product photo/listing for C9149.
Many Cometic gaskets are designed to be installed dry. Use sealant only where the factory service manual specifically calls for it. Overuse of sealant can interfere with proper sealing or block oil passages.
At minimum you will need a quality torque wrench and basic hand tools. A Harley-Davidson service manual for your specific Twin Cam model is strongly recommended to ensure correct torque values, sequences, and procedures.
Cometic is a well-regarded performance and replacement gasket manufacturer. Their Twin Cam kits are commonly used in performance and rebuild applications and often offer improved sealing materials over some OEM applications, but exact benefits depend on the specific engine build and usage.
Installation Guide
Difficulty
Medium
Est. Time
3 hr 0 min
Tools Required
- Harley-Davidson service manual for specific Twin Cam model
- Basic metric/SAE socket set
- Torx and Allen/hex bit set
- Torque wrench (inch-lb and ft-lb range as required by service manual)
- Gasket scraper or plastic razor scraper
- Brake cleaner or engine-safe degreaser
- Shop rags
- Feeler gauges (if checking valve/rocker specs)
- Straightedge (to check mating surfaces)
- Thread locker (as specified by OEM manual)
Pro Tips
- Lay out all gaskets and compare to removed OEM gaskets to ensure proper placement before assembly
- Photograph each step during disassembly for easier reassembly reference
- Use a plastic scraper and solvent to clean surfaces without gouging aluminum
- Dry-fit critical gaskets (rocker box, cam cover, etc.) to confirm orientation and hole alignment
- Follow the Harley-Davidson service manual torque specs and tightening sequences exactly
- After first heat cycle, inspect for minor seepage around covers and fasteners and recheck torque where allowed
Common Mistakes to Avoid
- Reusing old gaskets or O-rings instead of replacing everything provided in the kit
- Not thoroughly cleaning gasket surfaces, leaving old material that can cause leaks
- Incorrect torque sequence or torque values on heads, rocker boxes, and covers
- Using sealants on gaskets that are designed to be installed dry (can cause improper sealing)
- Pinching or misaligning gaskets during assembly
- Failing to verify correct kit for exact year/model/configuration of Twin Cam
Comparison vs Stock/OEM
Designed as a high-quality replacement and performance-oriented gasket set for Harley-Davidson Twin Cam engines. Often chosen over OEM for rebuilds and performance builds due to Cometic’s materials and sealing technology.
Improvements
- High-quality gasket materials engineered for Twin Cam operating temperatures and loads
- Comprehensive kit layout designed for a full top-end/EST service
- Widely used in performance and racing applications
Considerations
- Must match the exact engine configuration and year range to ensure correct fit
- Installation quality (surface prep and torque procedures) is critical to realize benefits
Durability & Warranty
Expected Lifespan
Intended to meet or exceed OEM service life when installed correctly on a healthy engine.
Warranty
Backed by Cometic’s standard manufacturer warranty; details should be confirmed at time of purchase or on Cometic’s official documentation.
Maintenance
No direct maintenance required for the gaskets themselves; monitor for oil seepage or coolant leaks during routine inspections, especially after initial heat cycles on a fresh rebuild.
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