Product Description
Interstate-McBee M-3920780 — Cylinder Head Bolt (Long) — 1989–1998 5.9L Cummins 12-Valve
OE-style long cylinder head bolt for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Manufactured to OE form and thread pitch for reliable clamping of the cylinder head to the block. Sold individually.
- Direct replacement: Matches Cummins reference 3920780 for B-Series applications.
- Durable construction: Built to handle stock torque specs when installed per the service manual.
- Service friendly: Designed for use with factory head gasket and washers.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3920780 |
| OEM Reference | Cummins 3920780 (Long Head Bolt) |
| Engine | 5.9L Cummins 12-valve (6BT) |
| Sold As | Each (1 long bolt) |
| Position | Cylinder head fastener — long length |
What’s Included
- (1) Long cylinder head bolt, P/N M-3920780
Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500 / 3500 — 5.9L Cummins 12-valve (1989–1998)
- Other B-Series applications where Cummins 3920780 is specified (confirm by ESN).
Important Notes
- The 12-valve 5.9L uses a mix of long and short head bolts. This listing is for the long bolt only. If replacing all hardware, order a complete set with the correct counts of long/short bolts.
- Do not reuse head bolts that show stretching, pitting, or damaged threads.
- Follow the factory tightening sequence and torque specifications from the Cummins service manual. Use clean threads and engine-safe assembly lube/oil as specified.
- Inspect and clean the block and head surfaces; verify dowel alignment and head gasket orientation.
Related/Recommended (sold separately)
- Short cylinder head bolt for 12-valve 5.9L (matching series)
- Cylinder head gasket for 12-valve 5.9L
- Head bolt washers (replace any worn or damaged hardware)
FAQ
Q: How many long bolts do I need?
A: The 12-valve uses both long and short bolts. Quantities vary by position; check the service manual or order a complete set to ensure the correct count.
Q: Are these torque-to-yield?
A: These are OE-style replacement bolts. Always follow the Cummins service manual procedure and specs for your ESN.
Q: Will this fit a 24-valve (1998.5–2002) engine?
A: No. This listing is for the 12-valve 5.9L (1989–1998) only.
