Product Description
Interstate-McBee M-3904408 Intake Valve Guide – 60.50 mm • 1989–1998 5.9L Cummins 12-Valve
OE-style intake valve guide for the 12-valve 5.9L Cummins (6BT). Manufactured to OE dimensions for reliable stem support, oil control, and long service life. Sold individually.
- Direct replacement: Matches OE geometry for proper concentricity and stem clearance once fitted.
- Built for service: Ready for press-fit installation; final sizing/reaming to spec is performed after install.
- Interstate-McBee quality: Consistent tolerances for repeatable valve train rebuilds.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3904408 |
| Application | Intake valve guide |
| Overall Length | 60.50 mm |
| Sold As | Each (1 guide) |
| Qty Required | 6 per engine (intake only) |
What’s Included
- (1) Intake valve guide, P/N M-3904408
Vehicle Fitment
Always confirm by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with 5.9L Cummins 12-valve (6BT)
- Model Years: 1989–1998
- Other B-Series applications where M-3904408 is specified (verify by ESN).
Recommended/Related Parts
- Intake valve kit (pair with new valves during head service)
- Valve stem seals – intake
- Valve spring retainers and keepers (locks)
- Head gasket set (for top-end overhaul)
Install Notes
- Press guides using proper supports and follow the cylinder head manufacturer’s temperature/clearance recommendations.
- After installation, ream or hone to final stem clearance per Cummins service specifications.
- Check installed height, valve seal fit, and runout; lap or cut seats as required.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary B-series valvetrain parts
FAQ
- How many do I need? Six for the intake side on a 12-valve engine (12 total guides if servicing both intake and exhaust).
- Is machining required? Yes—guides are sized to final clearance after installation.
- Does this fit 24-valve 5.9L engines (1998.5–2002)? No, this guide is for 12-valve applications only.
