Product Description
Interstate-McBee M-3904408 Intake Valve Guide (60.50mm) – 1989–1998 5.9L Cummins 12V
Heavy-duty 60.50 mm thick-wall intake valve guide engineered to OEM form, fit, and function for Cummins B-Series 5.9L 12-valve (6BT) engines. Ideal for cylinder-head rebuilds on 1989–1998 Dodge Ram 2500/3500 trucks and other B-Series applications. Built for precise valve control, excellent heat transfer, and long service life.
- Direct OEM cross-ref: Replaces Cummins 3904408 intake guide (B-Series).
- Precision 60.50 mm length: Maintains factory stem alignment and seat geometry.
- Thick-wall design: Durable construction for high-mileage work and towing applications.
- Aftermarket value: Interstate-McBee quality at a lower cost than OEM boxed parts.
Specifications
| Brand / Part No. | Interstate-McBee M-3904408 |
|---|---|
| OEM Reference | Cummins 3904408 (Intake) |
| Series / Engine | Cummins B-Series 5.9L 12V (6BT) |
| Length | 60.50 mm |
| Position | Intake valve guide |
| Material | Hardened guide material (thick-wall) |
| Sold As | Each (1) guide |
What’s Included
- (1) Intake valve guide, 60.50 mm length
Vehicle Fitment
For best results, verify by engine serial number (ESN).
- Dodge Ram 2500/3500 5.9L Cummins 12-Valve (6BT)
- Model Years: 1989–1998
- Other B-Series Applications: Common on Cummins 4B/6B industrial and equipment engines (confirm by ESN).
Installation Notes
- Press guides to the specified interference fit; heat head or chill guides as required by your machine shop.
- Finish size with proper reaming/honing to OE stem clearance; check concentricity and runout.
- After guide service, perform a valve job and verify installed height and seat width per Cummins specs.
Warranty
Interstate-McBee new engine parts carry manufacturer coverage; valve train components are typically covered for 12 months. Contact us for exact terms for this guide and professional installation requirements.
Cross-Reference & Related
Direct cross: Cummins 3904408 (intake, 60.50 mm).
Related/sister part: Cummins 3904409 (exhaust guide, ~51.75 mm). Consider new seals, springs, and retainers during any head rebuild.
Why Buy From CPP Diesel
- Diesel-specialist fitment support and ESN verification
- Fast shipping, easy returns, and reliable inventory
- One-stop valve-train kits for complete cylinder-head refresh
