Interstate-McBee M-3920780 Cylinder Head Bolt – 89–98 5.9L Cummins 12-Valve

Premium aftermarket cylinder head bolt engineered to OEM dimensions for 1989–1998 Dodge Ram 2500/3500 5.9L Cummins (12-valve) applications. Built for consistent clamping force and reliable sealing during stock refreshes or full top-end service.

• OEM cross-ref: Direct replacement for Cummins 3920780.
• Correct length & thread: M12 × 1.75 × 120 mm bolt used at factory-specified positions on 5.9L 12V heads.*
• Durable construction: Heat-treated alloy with flange head for even load distribution.
• Aftermarket value: Interstate-McBee quality at a lower cost than OEM.

Specifications

*Many catalogs label the 120 mm bolt as “medium.” Some listings refer to it as “long.” Verify by ESN or position chart.

What’s Included

• (1) Cylinder head bolt, M-3920780

Vehicle Fitment

Always verify by Engine Serial Number (ESN) for exact applications.

• Dodge Ram 2500/3500 5.9L Cummins (12-Valve)
  • Model Years: 1989–1998
• Also seen on: Cummins 4B/6B industrial variants (varies by ESN).

Set Composition (Reference)

A complete 5.9L 12V head bolt set typically uses:

• 6 × Short bolts – Cummins 3920779 (≈70 mm)
• 14 × Medium bolts – Cummins 3920780 (≈120 mm) (this part)
• 6 × Long bolts – Cummins 3920781 (≈180 mm)

Install Notes

• Clean threads and block holes; chase if needed. Lightly oil under-head flange and threads if specified by the manual.
• Follow the factory torque/angle sequence for your ESN; replace any stretched or damaged bolts.
• Do not mix reused bolts with new hardware; consider replacing the full set during head gasket service.

Warranty

Interstate-McBee new parts carry manufacturer warranty coverage. Contact us for terms applicable to head fasteners.

Why Buy From CPP Diesel

• ESN-verified fitment support from diesel specialists
• Fast shipping & hassle-free returns
• Curated B-Series inventory for complete top-end service

FAQ