Product Description
Interstate-McBee M-4089976 Piston Kit (.020 Over) – 2003–2004 5.9L Cummins 305HP
Premium aftermarket .020" (0.50 mm) oversize piston kit engineered for the 2003–2004 5.9L Cummins ISB (305 HP). Each kit services one cylinder and includes a piston, piston ring set, wrist pin, and pin retainers for an OEM-style rebuild.
- Direct application: 2003–2004 Dodge Ram 2500/3500 5.9L Cummins 305 HP configurations.
- Complete per-cylinder kit: Piston, ring pack, hardened wrist pin, and retainers.
- OEM-equivalent geometry: Built to OE form/fit/function for reliable sealing and durability.
- Aftermarket value: Interstate-McBee quality at a budget-friendly price point.
What’s Included
- (1) Piston – .020" (0.50 mm) oversize
- (1) Piston ring set (matched to piston)
- (1) Hardened wrist pin
- (2) Pin retainers/locks
Specifications
| Brand | Interstate-McBee |
|---|---|
| Part Number | M-4089976 |
| Oversize | .020" (0.50 mm) |
| Sold As | Single-cylinder kit (order 6 for a full engine) |
| Cross-Reference | Cummins 4089976; ring ref: 2243672WR020 |
| Applications | ISB 5.9L (Tier 2 era, truck applications noted below) |
Vehicle Fitment
Always verify by VIN/engine tag and emissions label.
- Dodge Ram 2500/3500 – 5.9L Cummins ISB (24-valve)
- 2003: High Output (HO) 305 HP only (VIN 8th digit “C”).
- Early 2004 (Federal emissions): 305 HP. Not for California emissions trucks.
Install Notes
- Machine the block to correct finish and clearance for .020" oversize pistons; do not mix bore sizes across cylinders.
- Measure piston-to-wall, ring end gaps, and pin fit; follow Cummins service manual specs and torque procedures.
- Quantity required: (6) kits for one complete engine.
Warranty
Interstate-McBee new engine components include manufacturer warranty coverage. Contact us for specific terms for piston and ring kits.
Why Buy From CPP Diesel
- Tech-verified fitment for HO vs. SO and Federal vs. California emissions builds.
- Fast shipping options and hassle-free returns.
- Matched add-ons available: bearings, gaskets, and complementary machine-shop supplies.
FAQ
Does this kit fit all 2003–2004 trucks?It fits 305 HP engines only. For 2003 models, that is the High Output (VIN 8th digit “C”). For early 2004 Federal-emissions trucks, 305 HP applies. It is not for California emissions 2004 trucks or Standard Output engines (VIN “6”).
What exactly is included?
One cylinder’s piston kit: piston, ring set, hardened wrist pin, and pin retainers. Order six kits for a full rebuild.
Is machining required for .020" oversize?
Yes. The cylinder bores must be machined and finished to the correct clearance and surface profile for .020" pistons.
Can I mix standard and .020" cylinders?
Mixing bore sizes in the same engine is not recommended. Machine and build all cylinders to the same specification.
Product Videos
Custom Field
YEAR 2003-2004
MAKE DODGE
ENGINE 5.9L
