Product Description
Cummins 3904408 OEM Valve Stem Guide Intake Thick Wall 60.50MM – 5.9L 12V 6BT (1989–1998)
The Cummins 3904408 OEM Valve Stem Guide is a genuine replacement intake valve guide designed for 1989–1998 Cummins 5.9L 12-Valve 6BT diesel engines. Manufactured to OEM specifications, this thick-wall 60.50mm valve guide helps maintain proper valve alignment, reduce valve stem wear, and support long-term cylinder head durability.
Whether you're performing a complete cylinder head rebuild, valve job, or preventative maintenance, the Cummins 3904408 intake valve guide delivers the fit, reliability, and performance expected from genuine Cummins engine components. Designed specifically for 12-valve cylinder heads, this guide helps restore proper valve train operation and maintain compression, airflow, and engine efficiency.
Features
- Genuine Cummins OEM replacement component
- Designed for intake valve applications
- Thick-wall valve guide construction
- 60.50mm overall length
- Maintains proper valve stem alignment
- Helps reduce valve stem and guide wear
- Supports proper valve sealing and engine compression
- Manufactured to Cummins OEM specifications
- Ideal for cylinder head rebuilding and valve service
- Built for long service life and durability
Fitment
- 1989–1998 Cummins 5.9L 12-Valve 6BT engines
- Dodge Ram 2500 equipped with 5.9L Cummins diesel
- Dodge Ram 3500 equipped with 5.9L Cummins diesel
- Industrial 5.9L Cummins 6BT applications
- Marine and agricultural 5.9L Cummins applications where applicable
- Cylinder head rebuilds and valve train service
Note: This valve guide is designed for intake valve locations. Always verify engine serial number, cylinder head casting, and valve guide dimensions before ordering.
What's Included
- One (1) Cummins 3904408 OEM Intake Valve Stem Guide
Specifications
- Manufacturer: Cummins
- Part Number: 3904408
- Component Type: Intake Valve Stem Guide
- Guide Style: Thick Wall
- Overall Length: 60.50mm
- Material: OEM Cast Guide Material
- Engine Platform: Cummins 5.9L 12-Valve 6BT
- Engine Years: 1989–1998
- Valve Location: Intake
- Application: Cylinder Head Service and Rebuilds
- OEM Replacement: Yes
Cross Reference Numbers
3904408, Cummins 3904408, 5.9L Cummins Intake Valve Guide, 12-Valve Valve Guide, 6BT Valve Guide
FAQ
What engine does the Cummins 3904408 fit?
This valve guide is designed for 1989–1998 Cummins 5.9L 12-Valve 6BT diesel engines.
Is this an intake or exhaust valve guide?
The Cummins 3904408 is an intake valve stem guide designed specifically for intake valve locations.
Why replace valve guides during a cylinder head rebuild?
Worn valve guides can cause excessive valve stem movement, oil consumption, poor sealing, reduced compression, and premature valve train wear. Replacing worn guides helps restore proper engine performance.
Is this a genuine Cummins part?
Yes. The 3904408 is an OEM Cummins replacement component designed to meet factory specifications.
How many valve guides are required per cylinder head?
The number required depends on the rebuild scope. Verify the quantity needed for your specific cylinder head before ordering.
Should valve guides be replaced with new valves?
For best results during a cylinder head rebuild, many engine builders inspect and replace worn valves, valve guides, valve seals, and seats as necessary.
