Product Description
Interstate-McBee M-3920779 Cylinder Head Bolt – Short | 89–98 5.9L Cummins 12V
Heavy-duty short cylinder head bolt engineered to OEM dimensions for 1989–1998 Dodge Ram 2500/3500 trucks with the 5.9L Cummins 12-valve (6BT). Built as a high-value aftermarket replacement that maintains correct clamping load and sealing performance during head gasket service or full top-end rebuilds.
- OEM-style fit & function: Direct replacement for Cummins 3920779 short bolt.
- Correct spec: Typical spec M12 × 1.75 × ~70 mm for short locations (verify by ESN).
- Durable materials: Designed for consistent preload and long service life in B-Series diesels.
- Service-friendly: Ideal when replacing individual damaged fasteners or refreshing a full set.
- Interchanges: Cross-refs include 3903938, J920779, J903938 (see notes below).
Specifications
| Brand / Part | Interstate-McBee M-3920779 |
|---|---|
| OEM Reference | Cummins 3920779 (hex flange head cap screw) |
| Thread / Size | M12 × 1.75 × ~70 mm (short position) |
| Position | Short cylinder head bolt (B-Series pattern) |
| Quantity per Engine | 6 short bolts used per 5.9L 12V (total set = 26 mixed lengths) |
Vehicle Fitment
Always verify by engine serial number (ESN) and model year split.
- Dodge Ram 2500/3500 — 1989–1998 with 5.9L Cummins 12-valve (6BT)
- Also used in: Many Cummins 4B/6B/ISB industrial and commercial B-Series applications.
Install Notes
- Clean threads and block holes; chase if needed. Lightly oil under-head flange and threads if specified by manual.
- Follow the Cummins service manual torque sequence and stages. Do not mix bolt lengths/locations.
- Best practice is to replace full sets during head gasket service. Inspect any reused bolts for stretch or damage.
Cross-Reference
Direct ref: Cummins 3920779. Common interchanges reported by suppliers include 3903938, J920779, J903938. For a full set, pair with M-3920780 (medium) and M-3920781 (long) to complete the 26-bolt array.
Why Buy From CPP Diesel
- Diesel-focused fitment help (ESN verification available)
- Fast shipping and easy returns
- Matched accessories: head gasket sets, studs, sealants, and torque tools
FAQ
How many short bolts are on a 5.9L 12-valve?Six short bolts are used per engine, alongside medium and long lengths (total set = 26 fasteners).
Is this bolt torque-to-yield (single use)?
Follow the Cummins manual for reuse guidance. Many builders replace head bolts during head gasket service to ensure consistent preload.
What’s the thread and length?
M12 × 1.75 pitch, short length ~70 mm (verify by ESN and model year).
Can I mix bolts from different brands?
For uniform clamping, use a matched set. If upgrading for performance, consider a complete head stud kit.
