Gaskets and Seals› Engine Gaskets and Seals

Cometic Gasket

Cometic Harley-Davidson Upper Rocker Box 1992-98 Rubber 1340 EVOS 5Pk

$38.61

SKU: C006 C9278

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $100
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

Part #: C9278

Today's lightweight engines are producing more horsepower, higher cylinder pressures, clamp loads and extreme temperatures. Our commitment is to provide innovative, quality gaskets while maximizing your engine's power and performance. Cometic's gaskets are proudly made in the USA with materials manufactured on American soil. We are constantly updating and adding models to our ever growing library of gaskets for Powersports, Street Bikes, Snowmobiles, Harley-Davidson and V-Twin applications.

Upper Outer Rubber Rocker Box Gasket | 5 Pack

MIA's Description

The Cometic Upper Rocker Box Rubber Gasket C9278 is an engine gasket designed to maintain oil pressure and prevent leakage. It features a dual-layer Viton construction that can withstand thermal cycling and mechanical stress. This gasket is suitable for rebuilding the top-end of an engine or for routine maintenance, ensuring the rocker assembly remains dry and the engine runs clean.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCometic Gasket
Part NumberC006 C9278

Videos

Cometic Gaskets presented by J&P Cycles.

Cometic Gaskets presented by J&P Cycles.
Harley Davidson Rocker Box Gaskets Replacement Made EASY

Harley Davidson Rocker Box Gaskets Replacement Made EASY
Review and Install of the Cometic Gasket for The Harley Primary Cover.

Review and Install of the Cometic Gasket for The Harley Primary Cover.
How To Install A Rocker Housing Gasket On A Harley-Davidson-DIY

How To Install A Rocker Housing Gasket On A Harley-Davidson-DIY
Back to Basics: Evo Sportster Rocker Box Gasket Service

Back to Basics: Evo Sportster Rocker Box Gasket Service
Cummins Valve Cover Gasket

Cummins Valve Cover Gasket
How To Replace Rocker Box Gaskets On A Harley Davidson Street Glide

How To Replace Rocker Box Gaskets On A Harley Davidson Street Glide
Cometic Gasket failure

Cometic Gasket failure
Cometic MLS Head Gaskets

Cometic MLS Head Gaskets
Reviewing Cometic's MLX Head Gaskets

Reviewing Cometic's MLX Head Gaskets

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy