✓ 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 Gasket Kit — Harley-Davidson Softail Heritage Classic, Softail Fat Boy, Road King (1999-2017)
$42.21
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Cometic Twin Cam EST gasket kit supplies every gasket, seal, washer, and o-ring needed for a complete engine overhaul on Twin Cam engines. Kit includes MLS head gaskets, steel Viton-coated base gaskets, blue Viton valve stem seals, and AFM material for reliable sealing across all engine surfaces.
Features
- MLS head gaskets
- Steel Viton-coated base gaskets
- Blue Viton valve stem seals
- AFM material components
- Complete kit — all gaskets and seals included
Specifications
- Brand: Cometic
- Manufacturer Part #: C9840
- Weight: 0.54 lbs
Fitment
Fits V-twin motorcycles with Twin Cam EST engines, including Harley-Davidson models.
Frequently Asked Questions
What's included in this gasket kit?
Every gasket, seal, washer, and o-ring needed for a complete engine overhaul — head gaskets, base gaskets, valve stem seals, and AFM material components.
Will this fit my Harley-Davidson?
This kit is designed for Harley-Davidson Twin Cam EST engines. Verify your engine type matches before ordering.
Do I need any additional gaskets or seals?
This is a complete overhaul kit, so all necessary gaskets and seals are included. You should not need to order additional sealing components.
What makes MLS head gaskets better than standard gaskets?
Multi-layer steel (MLS) gaskets provide superior sealing under high compression and heat compared to single-layer designs, reducing the risk of head gasket failure.
| 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?
