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Oct 17, 2025
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COMETIC
SKU: 68-9278
Cometic Evolution Big Twin Rocker Box Cover Gasket 5-Pack - Harley Evolution Big Twin
$38.61
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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 rocker box cover gasket is engineered as a direct OEM replacement for Evolution Big Twin engines, providing a reliable and leak-free seal. Offered in a convenient 5-pack, it's an essential item for any shop or rider maintaining multiple Harley-Davidson V-twins.
Why riders pick this
- OEM-spec rocker box cover gasket
- For Evolution Big Twin engines
- 5-pack quantity for service and spares
- Prevents oil leaks from rocker boxes
- Direct replacement for stock parts
Keeping your rocker box covers sealed effectively is crucial for preventing oil leaks and maintaining the performance of your Evolution Big Twin. Cometic delivers a high-quality gasket designed to stand up to the demands of your engine, ensuring a clean and efficient operation.
Precision Sealing for Your Big Twin
- Direct OEM replacement for Evolution Big Twin rocker box covers
- Engineered for consistent sealing under engine heat and pressure
- Convenient 5-pack quantity for multiple services or stocking spares
- Helps prevent oil seepage and maintain engine cleanliness
Maintain Your V-Twin's Integrity
Whether you're doing a routine service or a complete top-end overhaul, a fresh, high-quality gasket is paramount. This Cometic 5-pack of rocker box cover gaskets provides the reliable sealing you need for your Evolution Big Twin, ensuring your engine performs at its best without unnecessary leaks.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9278
- Length: 8.05 in
- Width: 8.5 in
- Height: 0.55 in
- Weight: 0.05 lbs per gasket
Common questions
What engine does this gasket fit?
This Cometic gasket is specifically designed for Evolution Big Twin (EVO) engines found in Harley-Davidson motorcycles and compatible V-twin platforms.
Why are these gaskets sold in a 5-pack?
The 5-pack quantity is ideal for professional shops, for riders performing multiple engine rebuilds, or for those who wish to keep spare gaskets on hand for future service needs.
Will this work on Twin Cam or Milwaukee-Eight engines?
No, this gasket is specific to Evolution Big Twin engines only. Twin Cam and Milwaukee-Eight engine families require different part numbers for their rocker box covers. Please confirm fitment for your specific year and model using our Shop by Bike tool.
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 | 68-9278 |
| WEIGHT | 0.05 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.69
16 RATINGS
5★
14
4★
1
3★
0
2★
0
1★
1
✓ VERIFIED
Jul 21, 2025
USPS damaged the gaskets
Came in USPS bent , I didn't use them and threw them in the trash after JP Cycle refunded me. I used my old ones and added gasket sealant to them.
✓ VERIFIED
Apr 18, 2025
It worked
Shipped super fast <br />Worked as it should
✓ VERIFIED
Sep 9, 2024
Great replacement gasket!
Great replacement for the OEM gasket. Fit perfectly and is a well made gasket.
✓ VERIFIED
Jun 2, 2024
packaging
The gaskets worked great, no more leaks, however the packaging could be better. The gaskets are metal and shipping them in an envelope makes for bent gaskets and crossed fingers hoping they won't leak.
✓ VERIFIED
Apr 18, 2024
When in need
A little expensive for two gaskets but worked as should
