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Start ShoppingCometic C9307F5 MLS Primary Drive Gasket – Durable & Reliable for Panhead/Shovelhead/Evo Big Twins
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Description
Upgrade your Harley-Davidson engine's reliability with Cometic's C9307F5 primary drive gasket. Designed for Panhead, Shovelhead, and Evo Big Twin models, this MLS gasket delivers unmatched durability and sealing performance to prevent leaks and maintain peak engine efficiency.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing strength and resistance to heat, oil, and compression for long-term reliability.
- 0.015" Thickness: Optimal compression fit for precise sealing without over-torquing, ensuring proper engine operation.
- Primary Drive Gasket Type: Specifically engineered for primary drive systems to prevent oil leaks and maintain engine integrity.
- Lightweight Design: Only 0.1 lbs, making installation easier without compromising durability.
Why Choose This Product
Cometic's C9307F5 gasket is trusted by riders worldwide for its precision engineering and compatibility with classic Harley-Davidson engines. The MLS material ensures consistent sealing under extreme conditions, while its lightweight design simplifies maintenance. Perfect for restoring vintage bikes or enhancing modern Big Twin performance with zero leaks and maximum reliability.
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Upgrade your Harley-Davidson engine's reliability with Cometic's C9307F5 primary drive gasket. Designed for Panhead, Shovelhead, and Evo Big Twin models, this MLS gasket delivers unmatched durability and sealing performance to prevent leaks and maintain peak engine efficiency.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing strength and resistance to heat, oil, and compression for long-term reliability.
- 0.015" Thickness: Optimal compression fit for precise sealing without over-torquing, ensuring proper engine operation.
- Primary Drive Gasket Type: Specifically engineered for primary drive systems to prevent oil leaks and maintain engine integrity.
- Lightweight Design: Only 0.1 lbs, making installation easier without compromising durability.
Why Choose This Product
Cometic's C9307F5 gasket is trusted by riders worldwide for its precision engineering and compatibility with classic Harley-Davidson engines. The MLS material ensures consistent sealing under extreme conditions, while its lightweight design simplifies maintenance. Perfect for restoring vintage bikes or enhancing modern Big Twin performance with zero leaks and maximum reliability.
| SKU | GMC70D0A20 |
|---|---|
| MPN | C9307F5 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Big Twin (Panhead, Shovelhead, Evolution) | 1948-1984 |
Frequently Asked Questions
Yes, C9307F5 fits Evolution Big Twins through 1984. For 1985+ 5-speed models, verify with Cometic part finder.
MLS gaskets are typically 0.015" thick vs stock paper at 0.020". Check primary chain adjustment clearance.
No, MLS gaskets are single-use only. The sealing layers crush during installation.
No, this is primary drive cover gasket only. Derby cover gasket sold separately (C4450).
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
- Torque to 84-108 in-lbs in crisscross pattern
- Use new lock tabs on primary cover bolts
- Apply light oil to gasket surfaces
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Incorrect torque sequence
- Reusing old lock tabs
Comparison vs Stock/OEM
Multi-layer steel vs single-layer paper/composite
Improvements
- Superior sealing under high heat/pressure
- Resists fuel/alcohol/oil permeation
- No compression set like paper gaskets
- Reusable primary cover (doesn't stick)
Considerations
- Slightly thinner than stock
- Single-use installation
Durability & Warranty
Expected Lifespan
Engine life (typically 50,000+ miles)
Warranty
Cometic lifetime defect warranty
Maintenance
Inspect during primary service intervals
What Others Are Saying
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