Product Description
Interstate-McBee M-3929881 Multi-Layer Exhaust Manifold Gasket — 1989–1998 5.9L Cummins 12-Valve
High-quality multi-layer steel (MLS) gasket designed as a direct replacement for the factory exhaust manifold gasket on the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Built for reliable sealing through repeated heat cycles. Sold individually.
- Durable MLS construction: Resists blow-outs and maintains clamp load under extreme EGT and vibration.
- Precision fit: OE-style port geometry for proper alignment and flow.
- Service ready: Ideal for manifold replacements, upgrades, or leak repairs.
- Value: Interstate-McBee quality at an aftermarket price.
What’s Included
- (1) Exhaust manifold gasket, P/N M-3929881
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
- Model Years: 1989–1998
- Additional B-Series applications (4B/6B) where Cummins 3929881 is specified (confirm by ESN).
Install Notes
- Inspect manifold and head surfaces; clean to bare metal and check for warpage.
- Use new hardware if corroded or stretched; torque in the OEM sequence and to spec.
- Warm up, cool down, then re-check fastener torque after one heat cycle.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of B-Series gaskets and manifold hardware
FAQ
Is this gasket reusable?
MLS gaskets are designed for durability, but reuse is not recommended. For best sealing results, install a new gasket during service.
Will this fit my 24-valve (1998.5–2002)?
No. This listing is for 12-valve 5.9L Cummins (1989–1998). Verify part numbers for 24-valve applications.
Do I need sealant?
No additional sealant is typically required. Install dry unless your OEM procedure specifies otherwise.
Specifications for Interstate-McBee M-3929881
| Brand | Interstate-McBee |
| Part Number | M-3929881 |
| UPC | Not specified by manufacturer/seller |
| GTIN | Not specified by manufacturer/seller |
| Shipping Info | Shipping weight and package dimensions are not specified by the manufacturer/seller. Typically ships as a small parcel item via standard ground service. |
| Cross Reference | Primary OEM cross reference: Cummins 3929881 (exhaust manifold gasket). Common associated Cummins/B-series references from aftermarket MLS gasket sets include: 3927154, 4429443, 3901356, 3905443, MS10141, MS-10141. |
| E-Codes | Not specified |
| Prop 65 | WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: https://www.P65Warnings.ca.gov |
