✓ 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: 68-9866
Cometic Evo Big Twin Rocker Box Base Gasket 10-Pack - Harley Evolution Big Twin
$317.000,00
Free shipping on orders $99+ · Best value guarantee
affirm
From $26.416,66/mo with Affirm.
See if you prequalify
IN STOCK
— Ships within 24 hours
Free Shipping on orders $99+
Best Value Guarantee
30-Day Returns — see policy
Authorized Dealer — sourced direct
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.
Keep your Evo Big Twin running leak-free with this 10-pack of Cometic Rocker Box Base Gaskets. Engineered with advanced materials, these gaskets provide reliable sealing under the demanding conditions of your V-twin engine.
Why riders pick this
- 10 rocker box base gaskets per pack
- Direct fit for Evo Big Twin engines
- Advanced gasket materials for durability
- Ideal for shops or multiple bike owners
For shops, serious builders, or riders who maintain multiple bikes, this 10-pack of Cometic Rocker Box Base Gaskets for Evo Big Twin engines is an essential stock item. These gaskets are crucial for a proper seal between the rocker box and the cylinder head, preventing oil leaks and maintaining optimal engine performance. Cometic’s commitment to advanced gasket materials ensures these components will stand up to the heat and vibration of your Evolution Big Twin.
Reliable Sealing in Bulk
- Convenient 10-pack quantity
- Direct replacement for Evo Big Twin rocker box base gaskets
- Engineered with advanced gasket materials for durability
- Ensures reliable, leak-free performance
Essential for Big Twin Maintenance
Rocker box leaks are a common annoyance, but with high-quality gaskets, they're easily preventable. This bulk pack allows you to always have the right gaskets on hand for routine maintenance, top-end refreshes, or unexpected repairs. Using Cometic gaskets means you're installing components trusted by performance builders to keep your Harley Evolution Big Twin sealed tight and performing strong.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9866
- Weight: 0.63 lbs
- Quantity: 10 per pack
Common questions
How many gaskets are included in this pack?
This Cometic Rocker Box Base Gasket pack includes ten gaskets, ideal for shops or riders servicing multiple Evo Big Twin engines.
Will these gaskets fit my Sportster or Twin Cam engine?
No, these gaskets are specifically designed for Evo Big Twin rocker box assemblies. Sportster and Twin Cam engines require different gasket part numbers.
Are these gaskets a direct replacement for OEM parts?
Yes, Cometic manufactures these gaskets to directly replace stock Evo Big Twin rocker box base gaskets, ensuring a precise fit without modification.
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 | 68-9866 |
| WEIGHT | 0.63 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?
