James Gaskets Big Twin Rocker Box Assembly Gasket - Cover Upper Rubber - Harley Big Twin
About James Gaskets
James Gaskets has supplied American V-twin gaskets, seals and O-rings for decades and is one of the most widely stocked names for Harley-Davidson engine, primary and transmission rebuilds. When a service manual calls for a specific gasket, James almost always has an exact-fit answer.
Maintain a dry top end on your early Big Twin with this James Gaskets rocker box upper cover gasket. Crafted from durable rubber, this gasket provides a reliable seal to prevent oil weepage from the rocker box assembly.
Why riders pick this
- Reliable rubber construction for optimal sealing
- Direct OEM-replacement for early Big Twin engines
- Designed for the upper rocker box cover position
- Helps prevent oil leaks from the top end
Oil leaks are not just messy; they can signal bigger problems. This James Gaskets upper rocker box cover gasket is an OEM-replacement designed specifically for early Big Twin engines, ensuring a precise fit and effective sealing. Its rubber construction is engineered to withstand the demanding environment of your V-twin, keeping oil where it belongs.
Secure Your Engine's Top End
- Durable rubber material for a lasting seal
- OEM-replacement specification for accurate fitment
- Seals the upper rocker box cover to the cylinder head
Essential for Rebuilds and Maintenance
Whether you're performing a full engine rebuild, addressing an existing leak, or simply conducting routine maintenance, replacing worn gaskets is crucial. This James Gaskets offering provides the quality and reliability needed to button up your early Big Twin's top end with confidence. Ensure your V-twin stays clean and performs as intended by using the right sealing components.
Specifications
- Brand: James Gaskets
- Manufacturer Part #: 17356-84-A
- Length: 6.95 in
- Width: 9.15 in
- Height: 0.5 in
- Weight: 0.125 lbs
Common questions
What part of the rocker box does this gasket seal?
This gasket seals the upper rocker box cover to the cylinder head, preventing oil from leaking around the perimeter of the cover on early Big Twin engines.
Is this gasket suitable for Milwaukee-Eight engines?
No, this gasket is specifically for early Big Twin engines and will not fit Milwaukee-Eight platforms, which use different gasket designs.
Is this a genuine OEM Harley-Davidson part?
This is a James Gaskets OEM-specification replacement part, manufactured to meet or exceed the performance of the original factory gasket.
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 | James Gaskets |
| TYPE | Gaskets/Seals |
| SKU | 681-4443 |
| WEIGHT | 0.13 lb |
