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Start ShoppingCometic C9278 Evo Big Twin Rocker Box Gasket - MLS Multi-Layer Steel Gasket for Enhanced Performance
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Description
Upgrade your engine's reliability with Cometic's high-performance MLS rocker box gasket. Engineered for Evo Big Twin applications, this gasket delivers exceptional sealing and durability to prevent leaks and ensure long-term engine efficiency.
Key Features
- Multi-Layer Steel (MLS) Construction: Combines steel layers with silicone beading for superior heat resistance and sealing integrity.
- 0.040 in. (1.02mm) Thickness: Precise dimensioning ensures perfect fit and optimal compression for leak-free performance.
- Single Gasket per Package: Ready-to-install design saves time and effort during engine maintenance.
Why Choose This Product
Cometic's MLS gasket offers unmatched durability for high-performance engines, preventing oil leaks and maintaining compression. The silicone beading provides flexibility to accommodate engine movement, while the precise thickness ensures compatibility with Evo Big Twin models. This gasket is a trusted choice for riders seeking reliable, long-lasting engine sealing solutions.
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Upgrade your engine's reliability with Cometic's high-performance MLS rocker box gasket. Engineered for Evo Big Twin applications, this gasket delivers exceptional sealing and durability to prevent leaks and ensure long-term engine efficiency.
Key Features
- Multi-Layer Steel (MLS) Construction: Combines steel layers with silicone beading for superior heat resistance and sealing integrity.
- 0.040 in. (1.02mm) Thickness: Precise dimensioning ensures perfect fit and optimal compression for leak-free performance.
- Single Gasket per Package: Ready-to-install design saves time and effort during engine maintenance.
Why Choose This Product
Cometic's MLS gasket offers unmatched durability for high-performance engines, preventing oil leaks and maintaining compression. The silicone beading provides flexibility to accommodate engine movement, while the precise thickness ensures compatibility with Evo Big Twin models. This gasket is a trusted choice for riders seeking reliable, long-lasting engine sealing solutions.
| SKU | GM7971F96F |
|---|---|
| MPN | C9278 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Evo Big Twin | 1986-1999 |
| Harley-Davidson | Softail | 1986-1999 |
| Harley-Davidson | Dyna | 1986-1999 |
| Harley-Davidson | Touring | 1986-1999 |
Frequently Asked Questions
Yes, fits all 1986-1999 Evo Big Twin rocker boxes including Softail models.
0.040" thickness - matches common stock spec but confirm your service manual.
Recommended during top-end work for best sealing results.
Designed for OEM-style Evo rocker boxes; check dimensions for custom applications.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- cleaning solvent
Pro Tips
- Clean surfaces with brake cleaner, apply thin layer of assembly lube to bolts, torque in crisscross pattern to spec (15-18 ft-lbs)
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Over-torquing rocker box bolts
Comparison vs Stock/OEM
MLS construction vs paper/composition OEM gasket
Improvements
- Superior heat resistance
- Better sealing under high compression
- Longer service life
Considerations
- Requires perfectly flat surfaces unlike compressible paper gaskets
Durability & Warranty
Expected Lifespan
Engine life with proper torque (100k+ miles typical)
Warranty
1 year manufacturer defect warranty
Maintenance
Re-torque rocker bolts after 500 miles initial run-in
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