Product Description
Build a stronger, cooler-running 5.9L Cummins with INDUSTRIAL INJECTION PDM-3672FCC.040 race pistons. These MAHLE-based, fly-cut pistons feature thermal crown and skirt coatings for durability under big fuel and boost. Sized .040" over for properly machined cylinders, and delivered as a complete drop-in set.
Fitment
- 2003–2004 Ram 2500/3500 5.9L Cummins (Common Rail, 24V)
What’s Included
- (6) Coated, fly-cut pistons — .040" overbore
- Matched rings, wrist pins, and clips
Key Features
- Fly-cut valve reliefs (.100") for added piston-to-valve clearance with high-lift cams
- Thermal crown + skirt coatings to manage heat and reduce scuffing
- Designed for high cylinder pressure competition builds
- Complete, drop-in set with rings, pins, and clips
Recommended Parts (CPP internal links only)
- ARP 247-4202 Head Stud Kit (5.9/6.7 24V)
- ARP 247-4204 625+ Head Stud Kit (for big boost)
- MAHLE HS54556 Head Gasket Set (03–07 5.9L) or HS54557 (Std Bore MLS)
- MAHLE GS33493 Cylinder Head Bolt Set (if not upgrading to studs)
- TOTAL SEAL S4194 40 Gapless 2nd Ring Set (4.056" / .040 over)
- Shop All Cummins Pistons & Rings
Helpful Notes
- Machine work required: Bore/hone to .040" over and confirm piston-to-wall and ring end gaps.
- Verify gasket thickness, cam specs, and piston-to-valve clearance for your combo.
FAQ
Will these fit all 2003–2004 5.9L engines?Yes—these are designed for 2003–2004 5.9L Cummins common rail (24V) applications. Always verify by VIN/ESN if you’re unsure.
Do I need the .100" fly-cut reliefs?They are recommended when running high-lift cams and tight PTV clearances. They provide extra margin under heat and RPM.
Are rings included?Yes. The set includes rings, wrist pins, and clips matched to the .040" over pistons.
Studs or bolts?Studs are strongly recommended for higher boost/power (e.g., ARP 247-4202 or 247-4204). Bolts can work for mild builds but are single-use.
