Product Description
The Cummins 3920779 OEM Cylinder Head Bolt (Short) is the factory-correct fastener used in 1989–1998 Dodge Ram 2500/3500 5.9L 12-Valve Cummins engines. These short-length bolts are critical for maintaining proper clamping force across the cylinder head and head gasket. Using genuine Cummins hardware ensures correct torque-to-yield characteristics, thread engagement, and long-term durability under high combustion pressures, towing loads, and performance conditions.
If you are rebuilding a 12-valve cylinder head, replacing a head gasket, or refreshing high-mileage hardware, the 3920779 short bolt is essential for OE-spec sealing and reliability. Always replace cylinder head bolts—never reuse torque-to-yield hardware.
Fitment
- 1989–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (6BT)
- Applicable to OEM 12-valve cylinder head designs requiring short-length bolts
- Used alongside long head bolts (sold separately)
Note: Cummins 12-valve engines use multiple bolt lengths. Verify count and location during installation.
Cross-Reference (Cummins-Only)
Common companion Cummins 12-valve components:
• Cummins 3920781 OEM Rocker Arm Bolt – 5.9L 12V
• Cummins 3904408 Valve Stem Guide – 60.50mm
• Cummins 3904409 Valve Stem Guide – 51.75mm (Short)
FAQ
Where are the short head bolts used on the 12-valve Cummins?
Short bolts such as 3920779 are installed in specific upper locations where shorter clamping depth is required. Always follow the Cummins bolt map.
Are Cummins 12-valve head bolts torque-to-yield?
Yes. Cummins recommends replacing head bolts every time the head is removed. Reusing bolts risks failure and poor gasket sealing.
Can I mix aftermarket and OEM head bolts?
No. Mixing hardware changes clamping force. Always use a complete matched set—either full OEM or a complete performance stud/bolt kit.
Should I use thread lubricant or sealant?
Follow Cummins service specifications. Some bolts require clean engine oil; sealant is not used on standard 12V head bolts.
Specifications for cummins 3920779
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3920779 |
| Component Type | Cylinder Head Bolt (Short) |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used with long head bolt P/N varies by ESN |
| E-Codes | N/A |
| Shipping Weight | 0.15 lbs |
| Package Dimensions | 4 x 1 x 1 in |
| Prop 65 Warning | Not Applicable |
