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Start ShoppingCometic C9576 Twin Cam Rocker Box Gasket Kit - High-Performance AFM Gasket for Harley-Davidson Engines
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Description
Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9576 Twin Cam Rocker Box Assembly Gasket Kit. Engineered with advanced AFM material and precision manufacturing, this kit ensures optimal sealing and long-lasting performance for top-end service.
Key Features
- COMETIC AFM Material: Durable aluminum foam construction resists heat and oil degradation for superior sealing.
- Reusable Components: Designed for multiple installations, reducing long-term costs and waste.
- USA-Made Quality: Manufactured in the U.S. with strict quality control for consistent performance.
- Complete Gasket Set: Includes all necessary seals for rocker box and cover assemblies.
Why Choose This Product
Cometic's Twin Cam gasket kits are trusted by mechanics and riders for their ability to handle high-performance engines. The AFM material provides better heat resistance than traditional fiber gaskets, while reusable components save time and money. Perfect for Harley-Davidson Twin Cam engines, this kit ensures leak-free operation and extends engine life with reliable sealing under demanding conditions.
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Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9576 Twin Cam Rocker Box Assembly Gasket Kit. Engineered with advanced AFM material and precision manufacturing, this kit ensures optimal sealing and long-lasting performance for top-end service.
Key Features
- COMETIC AFM Material: Durable aluminum foam construction resists heat and oil degradation for superior sealing.
- Reusable Components: Designed for multiple installations, reducing long-term costs and waste.
- USA-Made Quality: Manufactured in the U.S. with strict quality control for consistent performance.
- Complete Gasket Set: Includes all necessary seals for rocker box and cover assemblies.
Why Choose This Product
Cometic's Twin Cam gasket kits are trusted by mechanics and riders for their ability to handle high-performance engines. The AFM material provides better heat resistance than traditional fiber gaskets, while reusable components save time and money. Perfect for Harley-Davidson Twin Cam engines, this kit ensures leak-free operation and extends engine life with reliable sealing under demanding conditions.| SKU | GM13D39DB7 |
|---|---|
| MPN | C9576 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Twin Cam 88-equipped models | 1999-2006 |
Frequently Asked Questions
It is listed as a Twin Cam rocker box assembly gasket kit and is generally used on Twin Cam 88 engines from the early years (around 1999–2006). Because fitment details vary by sub-model and year, always verify using your VIN and an OE parts fiche or contact the retailer/manufacturer with your exact bike information.
C9576 is described as a rocker box assembly gasket kit, which is intended to service the rocker box area. Check the product image and contents list from the retailer to confirm it includes all layers you need (upper, middle, and lower gaskets) for your specific service.
Cometic AFM gaskets are designed to be re-torqued and, in many cases, reused if they are undamaged and not crushed or torn. However, for best sealing—especially on a Twin Cam rocker box where access is labor‑intensive—most technicians treat top-end gaskets as single‑use parts.
Most of the AFM and fiber gaskets are installed dry. Follow the Harley-Davidson service manual and any Cometic instructions; use sealant only in locations where it is specifically called for (e.g., at certain joint corners). Overuse of RTV can cause leaks or block oil passages.
Yes. Twin Cam rocker box service is normally performed with the engine in the frame, but you will need adequate access and should follow the service manual closely.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- Complete SAE socket set
- Allen/hex key set (SAE)
- Torque wrench (inch‑lb and ft‑lb for rocker box fasteners)
- Screwdrivers
- Razor/scraper or plastic gasket scraper
- Brake cleaner or gasket remover/solvent
- Shop rags
- Service manual for torque specs and tightening sequence
Pro Tips
- Have the factory service manual open to the Twin Cam rocker box procedure and follow torque stages exactly.
- Clean all mating surfaces thoroughly and inspect with a bright light for nicks or gouges; dress lightly if needed.
- Dry‑fit the gaskets to ensure alignment with all oil passages and bolt holes before final assembly.
- Allow any sealant used in specified areas to skin per manufacturer directions before initial start‑up.
- After first heat cycle, visually inspect for seepage around the covers.
Common Mistakes to Avoid
- Not following the correct rocker box bolt torque sequence, which can cause warping or leaks
- Over‑torquing small fasteners and damaging threads in the aluminum heads
- Leaving old gasket material on the head or box surface, leading to seepage
- Using excessive RTV/silicone where it is not specified by Harley or Cometic
- Mixing up gasket locations or installing them upside‑down
Comparison vs Stock/OEM
Cometic’s AFM-based rocker box gaskets are performance‑oriented replacements for OEM paper/composite gaskets, offering improved sealing and better resistance to heat and re‑torquing.
Improvements
- Better long‑term sealing compared to many OEM paper-style gaskets
- Tolerates minor surface irregularities thanks to AFM construction
- Can often be re‑torqued without immediate replacement
- Popular choice among engine builders and performance shops
Considerations
- Higher price than some OEM or economy gasket sets
- Best results depend on proper surface prep and torque procedure
Durability & Warranty
Expected Lifespan
Designed for long-term service life comparable to or better than OEM when installed correctly; many riders report multiple seasons of leak‑free operation.
Warranty
Backed by Cometic’s standard limited warranty against defects in materials and workmanship (details provided by retailer or Cometic directly).
Maintenance
No specific maintenance; periodically inspect rocker box area for signs of oil seepage during routine service.
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