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Start ShoppingCOMETIC C9307F1 Panhead/Shovelhead/Evo Big Twin Primary Gasket - High-Performance Engine Seal
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Description
Upgrade your Harley-Davidson engine's reliability with COMETIC's high-performance primary gasket. Engineered for Panhead, Shovelhead, and Evo Big Twin models, this gasket delivers exceptional sealing and durability to keep your ride running smoothly.
Key Features
- Stainless Steel Construction: Resists corrosion and heat for long-lasting performance in demanding engine environments.
- Perfect Fitment: Precision-engineered for Harley-Davidson Panhead, Shovelhead, and Evo Big Twin engines to ensure optimal sealing.
- Leak-Proof Seal: Advanced design minimizes oil leaks and maintains engine integrity under high-pressure conditions.
- Easy Installation: Compatible with standard gasket tools for hassle-free replacement without compromising performance.
Why Choose This Product
COMETIC's C9307F1 gasket combines aerospace-grade materials with motorcycle-specific engineering to deliver unmatched durability and reliability. Its stainless steel composition withstands extreme temperatures and chemical exposure, reducing the risk of premature failure. Whether you're restoring a classic Panhead or maintaining an Evo Big Twin, this gasket ensures consistent performance and peace of mind. The precise fitment guarantees a perfect seal, preventing costly oil leaks and engine damage. Trust COMETIC to provide the reliability you need for high-performance motorcycle applications.
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Upgrade your Harley-Davidson engine's reliability with COMETIC's high-performance primary gasket. Engineered for Panhead, Shovelhead, and Evo Big Twin models, this gasket delivers exceptional sealing and durability to keep your ride running smoothly.
Key Features
- Stainless Steel Construction: Resists corrosion and heat for long-lasting performance in demanding engine environments.
- Perfect Fitment: Precision-engineered for Harley-Davidson Panhead, Shovelhead, and Evo Big Twin engines to ensure optimal sealing.
- Leak-Proof Seal: Advanced design minimizes oil leaks and maintains engine integrity under high-pressure conditions.
- Easy Installation: Compatible with standard gasket tools for hassle-free replacement without compromising performance.
Why Choose This Product
COMETIC's C9307F1 gasket combines aerospace-grade materials with motorcycle-specific engineering to deliver unmatched durability and reliability. Its stainless steel composition withstands extreme temperatures and chemical exposure, reducing the risk of premature failure. Whether you're restoring a classic Panhead or maintaining an Evo Big Twin, this gasket ensures consistent performance and peace of mind. The precise fitment guarantees a perfect seal, preventing costly oil leaks and engine damage. Trust COMETIC to provide the reliability you need for high-performance motorcycle applications.
| SKU | GMEEDF301E |
|---|---|
| MPN | C9307F1 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Panhead Big Twin | 1958-1984 |
| Harley-Davidson | Shovelhead Big Twin | 1966-1984 |
| Harley-Davidson | Evolution Big Twin | 1984-1999 |
Frequently Asked Questions
Yes, fits 1966-1984 Shovelhead Big Twins.
Multi-Layer Steel (MLS) for superior sealing and durability.
Inspect primary cover screws and O-ring on inspection plate; replace if damaged.
0.015" thickness, comparable to stock; conforms better under torque.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- socket set
- torque wrench
- gasket scraper
- Harley primary lock tab tool
Pro Tips
- Clean surfaces with brake cleaner
- Apply light oil to bolts
- Replace primary chaincase screws with new ones if worn
- Torque to 84-108 in-lbs in crisscross pattern
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Over-torquing bolts
- Reusing old lock tabs
Comparison vs Stock/OEM
MLS construction vs. stock composite/paper; resists blowouts better
Improvements
- Superior sealing under high torque
- Resists heat and pressure
- Reusability in some cases
Considerations
- Slightly higher cost than OEM
Durability & Warranty
Expected Lifespan
Engine rebuild lifespan or 50,000+ miles
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect during primary service; no specific maintenance needed
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