Product Description
Interstate-McBee M-3929881 Multi-Layer Exhaust Manifold Gasket – 89–98 5.9L Cummins (12-Valve)
OEM-style multi-layer steel (MLS) exhaust manifold gasket engineered for 1989–1998 Dodge Ram 2500/3500 5.9L Cummins 12-valve applications. Designed to handle high EGTs and thermal cycling while maintaining a reliable seal between the cylinder head and exhaust manifold. Order quantity: six (6) gaskets per engine.
- MLS construction: Laminated steel layers resist blowouts and warping under heat.
- Direct-fit replacement: Matches OEM footprint for easy alignment and install.
- Performance-ready: Ideal for stock or tuned 12-valve engines with elevated EGTs.
- Aftermarket value: Interstate-McBee quality at a lower cost than OEM boxed parts.
Specifications
| Brand | Interstate-McBee |
|---|---|
| Part Number | M-3929881 |
| OEM Reference | Cummins 3929881 |
| Material | Multi-Layer Steel (MLS) |
| Position | Exhaust Manifold to Cylinder Head |
| Pieces Required | Six (6) per engine |
Vehicle Fitment
Verify by engine serial number (ESN) for best results.
- Dodge Ram 2500/3500 — 5.9L Cummins 12-Valve (6BT)
- Model Years: 1989–1998
- Also used on select Cummins B-Series (4BT/6BT) industrial variants.
Installation Notes
- Remove old gasket material completely; clean mating surfaces until smooth and oil-free.
- Follow Cummins service manual torque sequence/specs; retorque if the manual calls for it after heat-cycle.
- Consider new manifold bolts/hardware during service to maintain clamping force.
Warranty
Interstate-McBee new engine parts for diesel applications are generally covered for up to 24 months from installation (no mileage/hour limit). See manufacturer policy for exact terms.
Why Buy From CPP Diesel
- Fitment-first support with ESN verification on B-Series Cummins.
- Fast shipping, easy returns, and real diesel techs on the phones.
- Curated components that pair perfectly with common 12-valve upgrades.
FAQ
Is this a multi-layer (MLS) gasket?Yes. The M-3929881 uses a laminated multi-layer steel design for superior heat and pressure resistance.
How many gaskets do I need for one engine?
Six (6) total—one per exhaust port on the 5.9L Cummins 12-valve manifold.
Will this fit 1998.5–2002 24-valve engines?
No. This listing targets 1989–1998 12-valve applications. For late-1998.5+ 24-valve models, use the correct 24V-specific set.
Do I need sealant on MLS gaskets?
No additional sealant is typically required. Install dry unless your service manual specifies otherwise.
