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Start ShoppingCOMETIC C9506 MLS Seal - Premium Gasket for Panhead/Shovelhead/Evo Big Twin Engines
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Description
Upgrade your powersports engine's reliability with COMETIC's premium MLS seal engineered for Panhead, Shovelhead, and Evo Big Twin motorcycles. This high-performance gasket delivers unmatched sealing integrity and long-lasting durability for demanding riding conditions.
Key Features
- Multi-Layer Steel (MLS) Construction: Superior heat resistance and sealing performance for extreme engine temperatures.
- 0.040 in (1.020 mm) Thickness: Optimal compression for leak-proof sealing in high-revving engines.
- 3.437 in (87.30 mm) Bore Size: Precision-engineered fit for original equipment specifications.
- 4.125 in x 6.062 in Dimensions: Universal compatibility with major Big Twin engine configurations.
- 0.2 lbs Weight: Lightweight design for easy handling and installation.
Why Choose This Product
Engineers for maximum durability and sealing reliability, this MLS seal prevents oil leaks and maintains compression in high-performance engines. Its reinforced construction withstands thermal cycling and vibration, ensuring long-term performance. Perfect for restoration projects and daily riders seeking dependable engine protection. The precise bore size and dimensions guarantee a perfect fit, reducing installation time and ensuring optimal engine efficiency.
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Upgrade your powersports engine's reliability with COMETIC's premium MLS seal engineered for Panhead, Shovelhead, and Evo Big Twin motorcycles. This high-performance gasket delivers unmatched sealing integrity and long-lasting durability for demanding riding conditions.
Key Features
- Multi-Layer Steel (MLS) Construction: Superior heat resistance and sealing performance for extreme engine temperatures.
- 0.040 in (1.020 mm) Thickness: Optimal compression for leak-proof sealing in high-revving engines.
- 3.437 in (87.30 mm) Bore Size: Precision-engineered fit for original equipment specifications.
- 4.125 in x 6.062 in Dimensions: Universal compatibility with major Big Twin engine configurations.
- 0.2 lbs Weight: Lightweight design for easy handling and installation.
Why Choose This Product
Engineers for maximum durability and sealing reliability, this MLS seal prevents oil leaks and maintains compression in high-performance engines. Its reinforced construction withstands thermal cycling and vibration, ensuring long-term performance. Perfect for restoration projects and daily riders seeking dependable engine protection. The precise bore size and dimensions guarantee a perfect fit, reducing installation time and ensuring optimal engine efficiency.
| SKU | GMBD025DD7 |
|---|---|
| MPN | C9506 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Panhead Big Twin | 1948-1984 |
| Harley-Davidson | Shovelhead Big Twin | 1966-1984 |
| Harley-Davidson | Evolution Big Twin | 1984-1999 |
Frequently Asked Questions
Yes, C9506 fits 3.437" stock bore Evolution Big Twins 1984-1999.
0.040" thick - typically same or slightly thicker than stock paper gasket.
No, uses stock head bolts but verify torque specs for MLS gasket.
No, this is stock 3.437" bore only. See C9510 or others for larger bores.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- torque wrench
- head bolt socket
- gasket scraper
- spray carb cleaner
Pro Tips
- Use Cometic sealant on both sides if desired
- Torque in 3 stages using crisscross pattern
- Check head and cylinder flatness before install
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Incorrect torque sequence
- Over-torquing MLS gasket
Comparison vs Stock/OEM
MLS construction vs paper composite - far superior sealing
Improvements
- Better heat resistance
- Handles higher compression
- Multiple layers conform to minor surface imperfections
Considerations
- Requires precise torque procedure
- More expensive than paper gasket
Durability & Warranty
Expected Lifespan
Engine rebuild lifespan (50,000+ miles)
Warranty
1 year Cometic manufacturer defect warranty
Maintenance
Inspect during top-end service, replace if damaged
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