Product Description
Restore compression and durability on your 5.9L 12-valve with INDUSTRIAL INJECTION’s stock-style .040" oversize MAHLE piston set. Purpose-built for OEM-like drivability and longevity, this kit comes complete with rings, wrist pins, and clips for a clean rebuild.
Fitment
- 1989–1998 Dodge Ram 2500/3500, 5.9L Cummins 12-Valve (6BT)
- Covers both 1989–1993 (VE pump) and 1994–1998 (P-pump) applications
- .040" (1.00 mm) oversize — requires machine shop overbore/hone
What’s Included
- (6) Stock-style pistons — .040" oversize
- Matched piston ring sets
- Wrist pins and retaining clips
Key Features
- Drop-in stock design for reliable street/tow performance
- Complete kit minimizes parts chasing at rebuild time
- Compatible with OEM compression ratio and bowl design for 12V builds
Recommended Parts (CPP Internal Links Only)
- ARP 247-4203 Head Stud Kit (1989–1998 12V)
- MAHLE HS4068 Upper Head Gasket Set (STD, 1989–1998)
- CUMMINS 3802423 OEM .040" Piston Ring Set (order 6) or Interstate-McBee M-3802423 .040" Rings
- MAHLE/Clevite CB-1413P Rod Bearings (STD)
- Shop All 12V Pistons & Rings (Category)
- Studs & Bolts (Category)
Helpful Notes
- Machine work required: .040" overbore and precise piston-to-wall clearance/ring end gaps must be set by your machinist.
- For early 1989–1993 engines, verify bowl/compression height and cooling nozzle compatibility by ESN before ordering.
FAQ
Is this a complete piston kit?Yes. It includes six pistons, ring sets, wrist pins, and clips for a full 12-valve 5.9L build.
Will these pistons change compression?No. They are stock-style replacements intended to maintain OEM-like compression and drivability when used with correct head gasket thickness.
Do I need head studs with stock pistons?Studs are not required for stock power, but ARP studs add clamp load and sealing margin—recommended for towing, tuning, or heavy use.
What oversize should I choose?Use the smallest oversize that cleans up the cylinders. This listing is .040"; confirm with your machinist before ordering.
