Product Description
Cummins 4089651 — Upper Engine Gasket Kit (.020 Thicker Head Gasket)
MPN: 4089651 | Also Known As: upper gasket set, head set | Related: 4089649 (standard thickness)
Why This Part
- ✓ .020" thicker head gasket ideal for decked block/head rebuilds.
- ✓ OE sealing materials to restore compression and fluid sealing.
- ✓ Direct-fit for 1989–1998 5.9L 12-valve Cummins (verify by ESN).
- ✓ Bundles critical upper gaskets so you can finish the job in one go.
Quick Specs
| Type | Upper engine gasket kit (includes .020" thicker head gasket) |
|---|---|
| OE Part # | 4089651 |
| Engine | 5.9L Cummins 12-Valve (6BT) |
| Qty Required | 1 kit per engine |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L Cummins 12-Valve (6BT) | Dodge Ram 2500/3500 |
Compatibility Notes: For 1998.5–2002 24-valve VP44 engines, use the application-specific kit (e.g., 4089649 for standard thickness); always confirm by Engine Serial Number (ESN).
Often Paired With
- Head studs/bolts: replace torque-to-yield hardware during head service
- Coolant & oil/filter: refresh after reassembly
- Machine shop services: pressure test & resurface if required
What’s In The Box
- (1) Genuine Cummins Upper Engine Gasket Kit 4089651 (.020" thicker head gasket)
- Typical contents: head gasket, intake/exhaust gaskets, valve cover & related upper seals (contents may vary by ESN)
Install Tips
- Verify deck/head flatness; choose .020" thickness for machined surfaces as required.
- Follow Cummins torque sequences and angle specs; retorque if procedure calls for it.
- Recheck fluids and leaks after initial heat cycle.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE?Yes—this kit targets 1989–1998 5.9L 12-valve Ram 2500/3500. For 1998.5–2002 24-valve VP44 engines, use the correct 24-valve kit and thickness. Verify by ESN.
WHEN SHOULD I CHOOSE THE .020" THICKER GASKET?Use .020" when the block or head has been decked/machined and you need to recover proper piston-to-head clearance and compression ratio.
WHAT’S INCLUDED IN THE KIT?Upper-end gaskets and seals for a cylinder-head service (head gasket, intake/exhaust gaskets, valve cover & related seals). Contents can vary by ESN.
IS THIS A GENUINE CUMMINS KIT?Yes—OE Cummins 4089651. For standard thickness, the related kit is 4089649.
ARE HEAD BOLTS OR STUDS INCLUDED?No—fasteners are sold separately. Consider new bolts or an ARP stud kit during head service.
