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

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