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Start ShoppingCometic C9148 Twin Cam EST MLS Head Gasket Kit - High-Performance Gaskets for Racing & Street Use
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Description
Elevate your Twin Cam EST engine's reliability and performance with Cometic's premium gasket kit. Engineered for both racing and street use, this complete top- and bottom-end gasket set delivers unmatched sealing integrity and long-term durability under extreme conditions.
Key Features
- Multi-Layer Steel (MLS) Head Gaskets: Superior heat resistance and sealing performance for high-compression engines
- One-Piece Full-Length Steel Oil Pan Gasket: Eliminates leaks and ensures proper oil retention
- Fluorosilicone Rubber (FKM) Seals: Resists degradation from engine fluids and extreme temperatures
- 4.000 in. Bore Size Compatibility: Precision-fit for Twin Cam EST engines with exact dimensional accuracy
- 0.040 in. Compressed Thickness: Optimized sealing pressure for reliable performance
Why Choose This Product
Cometic's C9148 kit is engineered for riders who demand maximum engine performance and reliability. The combination of MLS steel, durable FKM seals, and precise fitment ensures long-lasting sealing even under high horsepower and heat. This complete gasket set eliminates the need for multiple parts, saving time and labor during installation. Whether you're modifying a street bike or racing competitively, this kit provides the foundation for a leak-free, high-performance engine build.
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Elevate your Twin Cam EST engine's reliability and performance with Cometic's premium gasket kit. Engineered for both racing and street use, this complete top- and bottom-end gasket set delivers unmatched sealing integrity and long-term durability under extreme conditions.
Key Features
- Multi-Layer Steel (MLS) Head Gaskets: Superior heat resistance and sealing performance for high-compression engines
- One-Piece Full-Length Steel Oil Pan Gasket: Eliminates leaks and ensures proper oil retention
- Fluorosilicone Rubber (FKM) Seals: Resists degradation from engine fluids and extreme temperatures
- 4.000 in. Bore Size Compatibility: Precision-fit for Twin Cam EST engines with exact dimensional accuracy
- 0.040 in. Compressed Thickness: Optimized sealing pressure for reliable performance
Why Choose This Product
Cometic's C9148 kit is engineered for riders who demand maximum engine performance and reliability. The combination of MLS steel, durable FKM seals, and precise fitment ensures long-lasting sealing even under high horsepower and heat. This complete gasket set eliminates the need for multiple parts, saving time and labor during installation. Whether you're modifying a street bike or racing competitively, this kit provides the foundation for a leak-free, high-performance engine build.| SKU | GMF472956D |
|---|---|
| MPN | C9148 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Twin Cam 88/96/103/110 Softail, Dyna, Touring, Sportster (select models) | 1999-2017 |
Frequently Asked Questions
EST features enhanced sealing technology with one-piece steel oil pan gasket and FKM seals for better durability in high-heat/high-pressure applications.
Yes, it includes MLS head gaskets at 0.040" compressed thickness, plus full top/bottom end seals.
Designed for performance builds; suitable for stock but excels in stroker/boosted Twin Cam engines up to 12:1 compression.
No, this is specifically for 1999-2017 Twin Cam engines. Use C9112 or similar for Milwaukee-Eight.
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- engine hoist (recommended)
- feeler gauges
Pro Tips
- Follow Harley torque specs exactly; use assembly lube on bearings; pre-soak rubber gaskets in engine oil
Common Mistakes to Avoid
- Not cleaning surfaces thoroughly
- Incorrect torque sequence
- Over-compressing MLS gaskets
Comparison vs Stock/OEM
Superior to OEM paper/composite gaskets; MLS construction resists blowout under high cylinder pressure
Improvements
- Better sealing for boosted/stroker engines
- Higher heat tolerance
- Longer service life
Considerations
- Requires precise torque; not reusable like some OEM
Durability & Warranty
Expected Lifespan
50,000+ miles in stock applications; 20,000-30,000 in high-performance
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect during valve checks; no specific maintenance needed
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