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Start ShoppingCOMETIC C9259 MLS Head Gasket - Panhead/Shovelhead/Evo Big Twin Seal for Reliable Performance
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Description
Upgrade your motorcycle's engine reliability with COMETIC's premium MLS head gasket designed for Panhead, Shovelhead, and Evo Big Twin engines. This durable solution ensures perfect sealing and long-term performance for classic and modern bikes.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing and heat resistance for high-performance engines.
- 3.437 in (87.30mm) Bore Size: Precision-engineered for exact fitment on specified Harley-Davidson models.
- 0.040 in Thickness: Optimal compression and durability without compromising engine efficiency.
- Lightweight Design: Only 0.2 lbs reduces stress on engine components while maintaining structural integrity.
Why Choose This Product
Engineers at Cometic designed this head gasket to withstand extreme temperatures and pressures, preventing leaks and overheating. Its universal compatibility with major Big Twin models makes it a must-have for restoration and maintenance projects. The MLS material ensures long-lasting performance, reducing the risk of engine damage and costly repairs.
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Upgrade your motorcycle's engine reliability with COMETIC's premium MLS head gasket designed for Panhead, Shovelhead, and Evo Big Twin engines. This durable solution ensures perfect sealing and long-term performance for classic and modern bikes.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing and heat resistance for high-performance engines.
- 3.437 in (87.30mm) Bore Size: Precision-engineered for exact fitment on specified Harley-Davidson models.
- 0.040 in Thickness: Optimal compression and durability without compromising engine efficiency.
- Lightweight Design: Only 0.2 lbs reduces stress on engine components while maintaining structural integrity.
Why Choose This Product
Engineers at Cometic designed this head gasket to withstand extreme temperatures and pressures, preventing leaks and overheating. Its universal compatibility with major Big Twin models makes it a must-have for restoration and maintenance projects. The MLS material ensures long-lasting performance, reducing the risk of engine damage and costly repairs.| SKU | GMA866A072 |
|---|---|
| MPN | C9259 |
| 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, C9259 is for 3.437in stock bore Evolution Big Twin 1984-1999.
Multi-layer steel (MLS) for superior sealing under high compression.
Cometic MLS gaskets typically seal dry, but C5-R sealant can be used on aluminum surfaces.
0.040in is standard replacement; thinner for higher compression builds.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- head bolt kit
Pro Tips
- Use Cometic sealant on both sides if needed
- Follow Harley torque specs exactly
- Check piston-to-valve clearance
Common Mistakes to Avoid
- Not cleaning surfaces thoroughly
- Incorrect torque sequence
- Reusing old head bolts
Comparison vs Stock/OEM
MLS construction vs. OEM composite/paper gasket
Improvements
- Better sealing under high pressure
- Higher temperature resistance
- Suitable for performance builds
Considerations
- Requires precise torque specs
- More expensive than OEM
Durability & Warranty
Expected Lifespan
Engine rebuild lifespan (50,000+ miles)
Warranty
1 year Cometic manufacturer warranty
Maintenance
Inspect during top-end service; replace if damaged
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