Product Description
Interstate-McBee M-3920781 Cylinder Head Bolt – Rocker Arm (89–98 5.9L Cummins)
OE-style rocker arm (rocker lever) mounting bolt for 1989–1998 Dodge Ram 2500/3500 5.9L Cummins 12-valve engines. Interstate-McBee’s M-3920781 delivers the correct geometry and clamping force to secure the rocker lever to the cylinder head for consistent valve operation and long service life.
- Direct-fit replacement: Matches Cummins 3920781 specifications for form, fit, and function.
- High-strength steel: Built for heavy-duty valvetrain loads and repeatable torque retention.
- OE-style hardware: Correct flange head design for stable rocker alignment under load.
- Sold individually: Order the quantity needed for your rocker/lever service.
Specifications
| Brand | Interstate-McBee |
|---|---|
| Part Number | M-3920781 |
| OEM Reference | Cummins 3920781 |
| Also Known As | Rocker Arm Bolt, Rocker Lever Bolt, Cylinder Head Mounting Bolt (Rocker) |
| Cross-References | 3902344, 3903940, 040050 (and related distributor X-refs) |
| Material | High-strength steel, flange head cap screw |
| Sold As | Each (1 bolt) |
| Position | Rocker lever to cylinder head (valvetrain) |
Vehicle Fitment
Best practice: verify by Engine Serial Number (ESN) on edge-case builds.
- Dodge Ram 2500/3500 5.9L Cummins (12-Valve)
- 1989–1993 6BT 12V
- 1994–1998 6BT 12V
- Additional B-Series applications: Common across 3.9L 4B/4BT and 5.9L 6B/6BT industrial/ag platforms (varies by ESN).
Install Notes
- Clean threads and mating surfaces; chase threads if needed for consistent torque.
- Always follow the Cummins service manual for torque values and tightening sequence.
- Inspect removed bolts; replace any with damage, corrosion, or out-of-spec stretch.
What’s Included
- (1) Rocker arm mounting bolt (flange head)
Warranty
Interstate-McBee new parts include manufacturer warranty coverage. Contact us for current terms by part category.
Cross-Reference & Compatibility
Interchanges with Cummins 3920781 and common distributor references such as 3902344, 3903940, and 040050.
Why Buy From CPP Diesel
- Diesel-specialist fitment help for B-Series valvetrain service
- Fast shipping and easy returns
- Real tech support—ESN verification available
FAQ
Will this bolt fit my 1989–1998 5.9L 12-valve Cummins?Yes—this OE-style rocker lever bolt is listed for 1989–1998 Dodge Ram 5.9L 12-valve B-Series engines. Verify by ESN if your engine has mixed-year components.
Is it sold individually or as a set?
Sold individually. Order the quantity needed for your rocker lever service.
What torque should I use?
Follow the Cummins service manual for your exact engine/ESN. Proper torque and tightening sequence are critical to rocker alignment and valve lash stability.
How does Interstate-McBee compare to Genuine Cummins hardware?
Interstate-McBee offers an OEM-style, direct-fit solution at a lower cost. Genuine Cummins bolts are available if you need OEM-boxed components.
Product Videos
Custom Field
YEAR 1989-1998
MAKE DODGE
ENGINE 5.9L
