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Start ShoppingCOMETIC C9528 MLS Seal for Panhead/Shovelhead/Evo Big Twin - High-Performance Gasket
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Description
Ensure optimal engine performance and longevity with COMETIC's high-quality MLS seal engineered for classic Harley-Davidson engines. This precision-machined gasket delivers unmatched sealing reliability for demanding powersports applications.
Key Features
- Multi-Layer Steel Construction: Durable MLS material resists compression and heat for long-lasting sealing performance
- Exact Bore Size: 3.437" bore ensures perfect fit for Panhead/Shovelhead/Evo Big Twin engines
- Thick 0.040" Design: Optimal sealing pressure prevents leaks and maintains engine integrity
- Custom Dimensions: 4.125" x 6.125" size matches OEM specifications for precise installation
- Lightweight Construction: Only 0.2 lbs reduces stress on engine components while maintaining durability
Why Choose This Product
Upgrade your engine's sealing system with a gasket built for extreme conditions. The COMETIC C9528's MLS construction provides superior resistance to oil leaks, thermal expansion, and mechanical stress. Its precise dimensions ensure a perfect fit for classic Harley engines, while the lightweight design minimizes wear during installation and operation. Trusted by mechanics and riders alike, this seal combines performance with ease of use for reliable engine performance.
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Ensure optimal engine performance and longevity with COMETIC's high-quality MLS seal engineered for classic Harley-Davidson engines. This precision-machined gasket delivers unmatched sealing reliability for demanding powersports applications.
Key Features
- Multi-Layer Steel Construction: Durable MLS material resists compression and heat for long-lasting sealing performance
- Exact Bore Size: 3.437" bore ensures perfect fit for Panhead/Shovelhead/Evo Big Twin engines
- Thick 0.040" Design: Optimal sealing pressure prevents leaks and maintains engine integrity
- Custom Dimensions: 4.125" x 6.125" size matches OEM specifications for precise installation
- Lightweight Construction: Only 0.2 lbs reduces stress on engine components while maintaining durability
Why Choose This Product
Upgrade your engine's sealing system with a gasket built for extreme conditions. The COMETIC C9528's MLS construction provides superior resistance to oil leaks, thermal expansion, and mechanical stress. Its precise dimensions ensure a perfect fit for classic Harley engines, while the lightweight design minimizes wear during installation and operation. Trusted by mechanics and riders alike, this seal combines performance with ease of use for reliable engine performance.
| SKU | GMDB342BB4 |
|---|---|
| MPN | C9528 |
| 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
No, this is for Big Twin Evolution engines only. Sportsters use different part numbers.
0.040" is standard replacement. Use thinner (0.030") for high compression or thicker (0.051") to lower compression.
Multi-layer steel (MLS) construction for superior sealing and durability over composite gaskets.
Yes, rated for 87mm bores. Confirm your bore size doesn't exceed 3.437".
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- head bolt kit
Pro Tips
- Clean cylinder head and case surfaces meticulously
- Follow Harley torque specs in criss-cross pattern
- Use copper spray on both sides for Evo applications
Common Mistakes to Avoid
- Not cleaning surfaces thoroughly
- Incorrect torque sequence
- Using wrong thickness gasket
Comparison vs Stock/OEM
Superior MLS construction vs. stock composite/paper gasket
Improvements
- Better heat resistance
- Improved sealing under high compression
- Longer service life
Considerations
- Requires perfectly flat surfaces unlike forgiving stock gasket
Durability & Warranty
Expected Lifespan
50,000+ miles with proper torque
Warranty
1 year manufacturer defect warranty
Maintenance
Re-torque head bolts after 500 miles initial run-in
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