Product Description
Interstate-McBee M-4089649 Upper Engine Gasket Set – 1989–1998 5.9L Cummins 12-Valve
Quality aftermarket upper engine gasket set for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Designed as an OE-style replacement to refresh common top-end sealing surfaces during head service, injector work, or intake/exhaust repairs.
- OE-style fit: Matches factory dimensions and port shapes for reliable sealing.
- Top-end refresh: Ideal when removing the cylinder head, manifolds, or valve cover.
- Interstate-McBee value: Proven diesel components without the OEM price tag.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4089649 |
| Engine | 5.9L Cummins 12-valve (6BT) |
| Model Years | 1989–1998 |
| Sold As | Complete upper gasket set (see contents below) |
Typical Contents
Contents may vary slightly by production run; refer to product images/notes for exact list.
- Head gasket
- Valve cover gasket
- Intake and exhaust manifold gaskets
- Injector and connector tube sealing washers/O-rings
- Thermostat housing, water outlet, and miscellaneous top-end seals
- Other associated upper engine O-rings and crush washers
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with 5.9L Cummins 12-valve (6BT)
- Years: 1989–1998 (pre-1998.5 12-valve)
- Other Cummins B-Series applications where set M-4089649 is specified (confirm by ESN).
What’s Included
- (1) Upper engine gasket set – Interstate-McBee M-4089649
Recommended/Related Parts
- Interstate-McBee M-3283335 Head Gasket (12-Valve)
- Interstate-McBee M-3284377 Push Rod
- Interstate-McBee M-3802355 Intake Valve Kit
- Interstate-McBee M-3802356 Exhaust Valve Kit
- Interstate-McBee M-3900250 Valve Keeper (Locks)
Install Notes
- Clean and inspect all mating surfaces; check flatness per Cummins spec.
- Follow factory torque specs and sequences; replace torque-to-yield fasteners as required.
- Verify injector sealing surfaces; lubricate O-rings where specified.
- After assembly, perform coolant and oil leak checks and re-torque where applicable.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping and hassle-free returns
- Wide selection of complementary Cummins B-Series parts
FAQ
Does this set include a head gasket?
Yes—this is an upper engine set and typically includes the head gasket along with related top-end seals. Review the product images/notes for exact contents.
Will it fit my 24-valve (1998.5–2002) engine?
No. This listing is for 12-valve engines (1989–1998). For 24-valve applications, use the correct 1998.5–2002 kit.
Do I need anything else?
Consider fresh head bolts/studs, coolant, and related hardware. See the related parts above.
