Product Description
Cummins 4376348 — Engine Piston Kit (.020" Oversize) for ISB 6.7L
MPN: 4376348 | Also Known As: piston kit, oversize piston set (.020) | Oversize: +0.020" (+0.50 mm) | Kit Contents: piston, ring pack, wrist pin, pin retainers (1 cylinder)
Why This Part
- ✓ OE piston kit for re-bores that require +.020" oversize.
- ✓ Direct-fit for Ram 6.7L ISB (2007.5–2018)—match to your ESN.
- ✓ Includes rings, pin, and retainers for one cylinder.
- ✓ OE crown & skirt design for durability and sealing.
Quick Specs
| Type | Engine piston kit (.020" / +0.50 mm) |
|---|---|
| OE Part # | 4376348 |
| Engine | ISB 6.7L (24V common-rail) |
| Qty to Service Engine | 6 kits required (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2007.5–2018 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: Confirm oversize and compatibility by VIN/ESN. This kit services one cylinder; order six kits for a complete engine.
Often Paired With
- Standard-size piston kit: Cummins 4376347 (if no over-bore is required)
- Head gasket set & head bolts (recommended during top-end service)
- Main/rod bearings & rings as needed for full refresh
- Fresh oil & filter after engine reassembly
What’s In The Box
- (1) Genuine Cummins Piston Kit (.020") — piston, ring pack, wrist pin, retainers
- Order 6 kits to service all cylinders
Install Tips
- Measure bores after machining; verify required clearance & ring end gaps.
- Orient rings per service manual; lubricate pin/bore during assembly.
- Torque to spec and follow Cummins break-in procedure.
FAQ
WILL THIS FIT MY 2007.5–2018 6.7L CUMMINS RAM?Yes—this .020" oversize kit targets 2007.5–2018 Ram 6.7L ISB applications. Always verify oversize and ESN before ordering.
HOW MANY KITS DO I NEED?Each kit services one cylinder. You’ll need six kits to service the entire 6.7L engine.
WHAT’S INCLUDED IN THE KIT?One piston, matched ring set, wrist pin, and pin retainers—everything needed for one cylinder.
WHAT IF MY ENGINE IS NOT OVER-BORED?Use the standard-size piston kit (e.g., Cummins 4376347) if your bores remain at standard diameter.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 4376348 for proper fit, metallurgy, and longevity.
