✓ VERIFIED
May 16, 2026
not what I needed. description wasn't very clear but not worth sending back. oh well just have to be more careful next time
COMETIC
SKU: 68-9840
Cometic Twin Cam EST Complete Gasket Kit - Harley Twin Cam
$42.21
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About Cometic
Cometic Gasket manufactures multi-layer steel head gaskets and complete gasket kits in Concord, Ohio. On a built V-twin running higher compression or a big-bore kit, the MLS head gasket is what keeps the top end sealed — which is why Cometic is the default spec on so many engine builds.
This Cometic Twin Cam EST gasket kit is your all-in-one solution for a complete engine overhaul on your Twin Cam V-twin. It includes every gasket, seal, washer, and O-ring needed for a thorough rebuild. Featuring MLS head gaskets, steel Viton-coated base gaskets, and blue Viton valve stem seals, this kit ensures reliable sealing across all engine surfaces.
Why riders pick this
- Complete kit for Twin Cam engine overhaul
- MLS head gaskets for robust sealing
- Steel Viton-coated base gaskets for durability
- Blue Viton valve stem seals included
- AFM material components for full engine seal
When it's time to refresh your Harley-Davidson Twin Cam engine, this Cometic EST gasket kit provides the ultimate convenience and reliability. Designed to supply every single gasket, seal, washer, and O-ring required for a full engine overhaul, it takes the guesswork out of sourcing individual components. The advanced materials, including MLS head gaskets and Viton-coated base gaskets, are engineered to deliver a robust, leak-free seal, critical for maintaining peak performance and engine longevity.
Premium Sealing for Twin Cam Engines
- MLS (Multi-Layer Steel) head gaskets for superior sealing and durability
- Steel Viton-coated base gaskets resist extreme temperatures and chemicals
- Blue Viton valve stem seals ensure optimal valve guide sealing and oil control
- AFM material components provide comprehensive sealing for all engine surfaces
Confidence in Every Rebuild
This complete Cometic gasket kit is ideal for any Twin Cam engine project, from routine maintenance to a full performance build. By providing all necessary sealing components in one package, it streamlines your workflow and ensures you have compatible parts. It's designed specifically for Harley-Davidson Twin Cam EST engines, so always confirm fitment with your specific model and year to guarantee a perfect seal and optimal performance.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9840
- Weight: 0.54 lbs
Common questions
What parts are included in this Cometic gasket kit?
This kit is a complete overhaul set, including MLS head gaskets, steel Viton-coated base gaskets, blue Viton valve stem seals, AFM material components, and all other necessary washers and O-rings.
Will this gasket kit fit my specific Harley-Davidson model?
This kit is designed for Harley-Davidson Twin Cam EST engines. We recommend using our Shop by Bike feature to confirm compatibility with your exact model and year before purchasing.
Do I need to buy any other gaskets or seals separately for a full overhaul?
No, this is a complete engine overhaul kit. It contains all the essential gaskets and seals required for a full engine refresh or rebuild.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-9840 |
| WEIGHT | 0.54 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.36
14 RATINGS
5★
11
4★
0
3★
1
2★
1
1★
1
✓ VERIFIED
Mar 8, 2026
Gasket
Working fine was for my brother's bike
✓ VERIFIED
Oct 25, 2024
Works Fine at a lower cost
I usually have an OEM from Harley Davidson, I have used this twice on my 04 Electraglide, no leaks or issues. At a much lower price.
✓ VERIFIED
Jun 8, 2024
A mediocre gasket
I didn’t use this gasket after removing the derby and seeing the Harley gasket that I removed. No comparison in quality. I ended up going to the local dealer and bought an O.E. gasket.
✓ VERIFIED
Jun 6, 2023
A good buy
The gasket fit nicely and no leaks so far . The fitment was spot on .
✓ VERIFIED
May 4, 2023
There is nothing on them indicating they are actually Cometic gaskets. Are they Substitutes?
