Product Description
Restore factory reliability and sealing in your 2003–2004 5.9L Cummins with INDUSTRIAL INJECTION’s stock replacement piston set in .020" oversize. This is a complete kit with pistons, rings, wrist pins, and clips—ideal for freshen-ups and full rebuilds on early common-rail ISB engines.
Fitment
- 2003–2004 Dodge Ram 2500/3500 with 5.9L Cummins 24-valve (Common Rail)
- Bore size: .020" over (machine work required)
- Sold as a set of 6
What’s Included
- (6) Stock replacement pistons — .020" oversize
- Matched piston ring set
- Wrist pins and retaining clips
Why This Kit
- OE-style design for stock drivability and durability
- Complete package cuts parts hunting—drop into a properly machined block
- Proven fitment for 2003–2004 ISB 5.9L (24V common rail)
Recommended Parts (CPP Internal Links Only)
- ARP 247-4202 Head Stud Kit — 5.9L/6.7L Cummins
- MAHLE HS54557 Cylinder Head Gasket Set — 03–07 5.9L Cummins
- Cummins 3958645 OEM MLS Head Gasket (Thick) — 03–07 5.9L
- Shop All Cummins Pistons & Rings
- 03–07 Cummins Engine Parts (Gaskets, Bearings, Valvetrain & more)
Helpful Notes
- Machine work required: Block must be bored/honed to .020" over; verify piston-to-wall and ring end gaps.
- Confirm piston bowl/combustion design matches your model year injectors and cylinder head.
- Always measure and set piston protrusion and choose the correct MLS head gasket thickness.
FAQ
Is this a direct stock replacement?Yes. This is an OE-style piston set sized .020" over for 2003–2004 5.9L common-rail Cummins. Professional machining to .020" over is required.
What exactly is included?Six pistons, matched rings, wrist pins, and retaining clips—everything you need for the piston portion of your short block refresh.
Do these come coated?The stock kit is an OE-style replacement. If you need coated or performance pistons, see our performance and race variants for 03–04.
What else should I replace during a rebuild?We recommend new head fasteners (studs/bolts), an MLS head gasket or full top-end set, bearings, oil pump, and a thorough injector/nozzle inspection.
