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Start ShoppingCometic C9167 Twin Cam Rocker Box Gasket Kit - High-Performance Top-End Seals for Harley-Davidson Engines
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Description
Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9167 Twin Cam Rocker Box Assembly Gasket Kit. This precision-engineered gasket set ensures perfect sealing, preventing leaks and maintaining peak engine performance for riders who demand excellence.
Key Features
- High-Durability Materials: Made from premium-grade rubber and reinforced seals for long-lasting performance under extreme engine conditions.
- Complete Kit Coverage: Includes all necessary gaskets for full rocker box assembly replacement, saving time and ensuring comprehensive repairs.
- Harley-Davidson Compatibility: Specifically designed for Twin Cam engines, ensuring perfect fitment and optimal sealing on classic and modern H-D models.
- Easy Installation: Streamlined design reduces installation complexity, allowing mechanics and DIY enthusiasts to complete repairs efficiently.
Why Choose This Product
Cometic's C9167 gasket kit delivers unmatched reliability for Twin Cam engines, combining advanced materials with precise engineering. Riders benefit from improved engine efficiency, reduced risk of compression leaks, and extended service intervals. This trusted brand ensures your Harley's top-end components perform at their best, maintaining power delivery and preventing costly downtime. Whether you're restoring a classic or maintaining a modern Twin Cam, this gasket set provides the foundation for reliable, high-performance engine operation.
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Upgrade your Harley-Davidson Twin Cam engine's reliability with Cometic's C9167 Twin Cam Rocker Box Assembly Gasket Kit. This precision-engineered gasket set ensures perfect sealing, preventing leaks and maintaining peak engine performance for riders who demand excellence.
Key Features
- High-Durability Materials: Made from premium-grade rubber and reinforced seals for long-lasting performance under extreme engine conditions.
- Complete Kit Coverage: Includes all necessary gaskets for full rocker box assembly replacement, saving time and ensuring comprehensive repairs.
- Harley-Davidson Compatibility: Specifically designed for Twin Cam engines, ensuring perfect fitment and optimal sealing on classic and modern H-D models.
- Easy Installation: Streamlined design reduces installation complexity, allowing mechanics and DIY enthusiasts to complete repairs efficiently.
Why Choose This Product
Cometic's C9167 gasket kit delivers unmatched reliability for Twin Cam engines, combining advanced materials with precise engineering. Riders benefit from improved engine efficiency, reduced risk of compression leaks, and extended service intervals. This trusted brand ensures your Harley's top-end components perform at their best, maintaining power delivery and preventing costly downtime. Whether you're restoring a classic or maintaining a modern Twin Cam, this gasket set provides the foundation for reliable, high-performance engine operation.| SKU | GM864328A7 |
|---|---|
| MPN | C9167 |
| UPC/GTIN | 191070030964 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Frequently Asked Questions
C9167 is a rocker box assembly gasket kit for Harley-Davidson Twin Cam engines. It typically includes the main rocker box cover gaskets and related seals needed when removing/reinstalling the rocker box. Check the package or distributor listing for the exact contents for your engine family and year.
If the leak is due to worn or flattened rocker box gaskets and your rocker boxes are not warped or damaged, replacing the gaskets with a quality kit like Cometic C9167 often resolves the issue. If mating surfaces are warped or cracked, you may still see leaks even with new gaskets.
In most cases you install Cometic gaskets dry and follow the OEM service manual. Some engines call for a very small amount of sealant in specific corners or joints—only use sealant where the manual explicitly states and avoid coating the entire gasket.
No. Rocker box gaskets are considered one‑time‑use items. Once compressed and heat cycled, they should be replaced any time the rocker box is removed to ensure proper sealing.
No tuning changes are required for simply replacing rocker box gaskets. However, if you disturb pushrods or valvetrain components during the job, follow OEM or cam manufacturer procedures for adjustment before starting the engine.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- Harley-Davidson service manual for your exact model
- Standard and metric socket set
- Allen/hex key set
- Torque wrench (inch‑lb and ft‑lb)
- Screwdrivers
- Plastic scraper or gasket scraper (non‑metallic preferred)
- Brake cleaner or gasket-safe solvent
- Shop rags
- Threadlocker (as specified by OEM manual)
Pro Tips
- Lay out old gaskets and new C9167 kit on a clean bench and match each piece before disassembly so you know where each gasket goes.
- Photograph the rocker box stack‑up and breather components during tear‑down to ensure correct reassembly.
- Use a straightedge to quickly check rocker box surfaces for obvious warpage; if badly warped, address that or leaks may persist.
- Lightly oil O‑rings (if included in this kit for your application) before installation to help them seat without pinching.
- Always follow the factory service manual torque specs and tightening sequence for your exact Twin Cam model and year.
Common Mistakes to Avoid
- Not cleaning the rocker box and head surfaces completely before installing new gaskets
- Using RTV/silicone where it is not specified (can cause leaks or block oil passages)
- Incorrect torque sequence on rocker box and rocker arm fasteners, leading to warping or leaks
- Over‑torquing bolts and damaging the gasket or stripping threads
- Failing to recheck pushrod adjustment (where applicable) after reassembly
Comparison vs Stock/OEM
Cometic gaskets are an aftermarket replacement for OEM Harley-Davidson rocker box gaskets, designed to meet or exceed OEM sealing performance.
Improvements
- High-quality materials and precise cutting for better long-term sealing compared to many generic aftermarket kits
- Reputation for good oil sealing performance in performance and racing applications
- Often sold as complete engine-family-specific kits, making it easier to replace all relevant gaskets at once
Considerations
- Always verify the exact engine family/year and rocker box style before ordering; different Twin Cam variants can use different gasket kits.
- Does not correct warped or damaged rocker boxes or heads—surface issues must be addressed separately.
Durability & Warranty
Expected Lifespan
Generally comparable to or better than OEM rocker box gaskets when installed on clean, flat surfaces and torqued correctly.
Warranty
Standard Cometic limited warranty against defects in materials and workmanship (verify details with your distributor or on the package).
Maintenance
Periodically inspect for signs of oil seepage around the rocker boxes during routine service. No other special maintenance is required for the gaskets themselves.
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