Interstate-McBee M-3800784 Piston Kit .020 Over – 98.5–02 5.9L Cummins (Standard Output)

Restore factory performance on your 1998.5–2002 5.9L Cummins 24-Valve (Standard Output) with this OEM-style .020" (0.50 mm) oversize piston kit from Interstate-McBee. Built to OEM dimensions for reliable sealing, durability, and drop-in compatibility when your block is bored .020" over.

• Engineered to OEM spec: Matches Cummins geometry and ring groove dimensions for proper sealing.
• .020" (0.50 mm) oversize: For cylinders bored/honed .020" over standard.
• Complete kit per cylinder: Piston, ring set, wrist pin, and pin retainers—sold individually.
• Aftermarket value: Interstate-McBee quality at significant savings versus OEM-boxed parts.

Specifications

Vehicle Fitment

Always verify fitment by engine serial number (ESN) if possible.

• Dodge Ram 2500/3500 – 5.9L Cummins 24-Valve (Standard Output)
  • Model Years: 1998.5–2002
• Important: Intended for Standard Output applications. Some 2001–2002 trucks were High Output (NV5600); verify with ESN/parts data before ordering.

Cross-References & Options

• Standard bore: M-3800781 (per cylinder)
• .020" over: M-3800784 (this listing)
• .040" over: M-3800785 (per cylinder)
• OEM reference: Cummins 3800784

Installation Notes

• Confirm machine work to .020" (0.50 mm) oversize and maintain proper piston-to-wall clearance.
• Check ring end gaps and orientation per Cummins service procedures.
• Cleanliness is critical—thoroughly wash bores after honing to remove abrasive residue.

Warranty

Interstate-McBee new engine components carry manufacturer warranty coverage. For terms and claim procedure, contact us with your ESN and order details.

Why Buy From CPP Diesel

• ESN-verified fitment support to avoid returns and downtime
• Fast shipping, secure packaging, and hassle-free returns
• Real diesel techs available by phone or chat

FAQ