Product Description
Interstate-McBee M-3800784 Piston Kit – .020" Over (0.50 mm) — 1998.5–2002 5.9L Cummins 24-Valve ISB
Premium aftermarket piston kit for the 1998.5–2002 Dodge Ram 2500/3500 with the 5.9L Cummins 24-valve ISB (VP44). The .020" overbore (0.50 mm) kit is ideal for engines being rebuilt after wear or light scoring. Sold as a single-cylinder kit.
- Complete kit: Includes piston, piston rings (file-to-fit as required), wrist pin, and pin retainers.
- Correct oversize: .020" over (0.50 mm) to match common machine shop overbores.
- Durable construction: Built to OE-equivalent material and geometry for reliable service life.
- Direct fit: Designed for 24-valve ISB applications in 1998.5–2002 model years.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3800784 |
| Engine | 5.9L Cummins ISB (24-valve) |
| Model Years | 1998.5–2002 |
| Oversize | .020" over (0.50 mm) |
| Nominal Bore After Overbore | ~102.50 mm (machine-shop verified) |
| Kit Contents | (1) piston, (1) ring set, (1) wrist pin, (2) pin clips |
| Sold As | Each (single-cylinder kit) |
| Qty Required for Engine | 6 kits (one per cylinder) |
| Notes | Verify piston bowl/marking for your ESN; measure & set ring end gap |
What’s Included
- (1) Piston — .020" over
- (1) Piston ring set
- (1) Wrist pin
- (2) Wrist pin retainers/clips
Vehicle Fitment
Always confirm by engine serial number (ESN) and piston bowl code when possible.
- Dodge Ram 2500/3500 — 5.9L Cummins ISB, 24-valve (VP44)
- Model Years: 1998.5–2002
Recommended/Related Parts
- Rod bearings and main bearings (choose size to match crankshaft)
- Full gasket set / head gasket set
- Wrist-pin bushings (if rods are serviced)
- Oil pump and timing cover seals (while you’re in there)
Install Notes
- Block must be measured and machined/honed to the required clearance for this piston; do not rely on nominal size alone.
- File ring end gaps to spec; check in the honed cylinder.
- Confirm piston orientation (bowl/markings) and rod offset; verify piston protrusion and deck height per service manual.
- Use clean engine oil for pin installation unless otherwise specified; torque fasteners to factory specs.
Why Buy From CPP Diesel
- ESN-verified fitment support
- Fast shipping and easy returns
- Extensive inventory for Cummins ISB rebuilds
FAQ
Is this a complete engine set?
No. This is a single-cylinder piston kit. Order six for a complete engine.
What overbore size do I need?
Your machine shop will determine the correct oversize after measuring the block. This listing is for .020" (0.50 mm) over.
Are rings pre-gapped?
No. Always check and file ring end gaps to specification in the finished bore.
