✓ 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: 68-9551
Cometic Head & Base Gasket 2-Pack - Harley Evo Big Twin
$31.55
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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.
Restore the top-end integrity of your Harley-Davidson Evo Big Twin with this Cometic head and base gasket set. Sold as a 2-pack, these OEM-quality replacement gaskets are engineered to seal combustion pressure and oil passages, crucial for optimal V-twin motor performance.
Why riders pick this
- OEM-grade head and base gasket set
- 2-pack for one cylinder rebuild
- Engineered for Harley-Davidson Evo Big Twin
- Seals combustion pressure and oil passages
When you're diving into an Evo Big Twin top-end rebuild or refresh, the quality of your head and base gaskets can make or break the job. Cometic delivers with these OEM-grade replacements, designed to handle the heat and pressure of your V-twin. This 2-pack provides everything you need for one cylinder, ensuring a reliable, leak-free seal where it matters most for compression and oil containment.
Precision Sealing for Evo Big Twins
- OEM-grade gasket material for dependable performance
- Includes both head and base gaskets in a 2-pack
- Engineered to seal combustion pressure and oil passages
- Specifically designed for Harley-Davidson Evo Big Twin engines
Essential for Top-End Rebuilds
Whether you're chasing more power or just doing routine maintenance, proper sealing is key. These Cometic head and base gaskets are a critical component for ensuring your Evo Big Twin maintains optimal compression and prevents oil leaks. Invest in quality components for a build that lasts and performs.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9551
- UPC: 191070005184
- Quantity: 2 per pack
- Length: 6.05 in
- Width: 6.95 in
- Height: 0.3 in
- Weight: 0.01 lbs
Common questions
Will this fit my Harley Big Twin?
This gasket set is specifically for Evo Big Twin engines. Shovelhead and Milwaukee-Eight motors require different gasket sets. Please confirm your engine type before ordering.
Why does this come as a 2-pack?
This 2-pack provides one head gasket and one base gasket, which allows you to service one complete cylinder in a single purchase, covering the most common gasket service for Evo Big Twin rebuilds.
Do I need any special tools or sealant to install?
Standard gasket installation tools are sufficient. Always follow the engine manufacturer's recommended torque specifications and any specific sealant instructions for your model.
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 | 68-9551 |
| WEIGHT | 0.01 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?
