Interstate-McBee M-4089950 Piston Kit (Standard Bore) – 03–04 5.9L Cummins 305HP

OEM-style standard-bore piston kit engineered for 2003–2004 5.9L Cummins ISB (305 HP). Each kit services one cylinder and includes the piston, hardened wrist pin, retainers/clips, and piston rings for a durable, direct-fit rebuild.

• Direct replacement: Fits 5.9L ISB common-rail 305 HP applications (see fitment notes).
• Standard bore (STD): For unbored factory cylinder size.
• Complete per-cylinder kit: Piston + pin + retainers/clips + ring set.
• Aftermarket value: Interstate-McBee quality at a lower cost vs. OEM.

Specifications

Vehicle Fitment

Always verify with your engine serial number (ESN) and VIN.

• 2003 Dodge Ram 2500/3500 5.9L Cummins (High Output 305 HP only)
• Early 2004 Dodge Ram 2500/3500 5.9L Cummins – Federal emissions 305 HP trucks
• Not for 2004 California emissions trucks (different piston)
• VIN quick check: 8th digit C = High Output (305 HP); 6 = Standard Output

What’s Included

• (1) Piston (STD)
• (1) Hardened wrist pin
• (2) Retainers/clips
• (1) Piston ring set

Install Notes

• Confirm engine HP/EMISSIONS configuration and ESN before ordering.
• Measure cylinder and check ring end-gap per Cummins service manual.
• Observe piston orientation and correct pin/clip installation.

Warranty

Interstate-McBee new engine parts are covered by a manufacturer warranty—typically up to 24 months from installation under normal use. Contact us for details specific to piston kits.

Why Buy From CPP Diesel

• ESN-verified fitment support from diesel specialists
• Fast shipping options and straightforward returns
• Large in-stock selection for Cummins B-series rebuilds

FAQ