Product Description
Strengthen your late 5.9L Cummins bottom end with INDUSTRIAL INJECTION PDM-3673CC.040 Performance Pistons (.040" over). Built on MAHLE forgings, these competition-ready pistons feature chamfered crowns, a thermal barrier top coating, and a ceramic skirt coating for durability under high heat and cylinder pressure. Set of six with rings, wrist pins, and clips.
Fitment
- 2004.5–2007 Dodge Ram 2500/3500 5.9L Cummins (Common Rail, 24V)
- .040" oversize — machine shop bore/hone and clearance verification required
What’s Included
- (6) Performance pistons — .040" oversize
- Matched rings, wrist pins, and clips
Key Features
- Drop-in design (after machining to .040" over) with complete ring/pin/clip set
- Chamfered tops to help reduce scuffing in high-load operation
- Thermal barrier crown coating for better heat management
- Ceramic skirt coating to reduce friction and improve scuff resistance
- .100" fly-cut valve reliefs for high-lift camshaft clearance
Recommended Parts (CPP Internal Links)
- ARP 247-4202 Head Stud Kit — 5.9L/6.7L Cummins 24V
- MAHLE HS54556 Head Gasket Set — 2003–2007 5.9L Cummins
- CP3 Injection Pumps & Dual-Fueler Kits — 2003–2007 5.9L
- Camshafts & Valvetrain — 2003–2007 5.9L
- Shop All Cummins Pistons & Rings
Helpful Notes
- Machine to .040" over and set piston-to-wall clearance and ring end gaps per your build spec.
- Match valve reliefs, head gasket thickness, and cam lift to ensure piston-to-valve clearance.
Cross-Reference / Alternatives
- Industrial Injection PDM-3673.040 — Stock Pistons (.040 Over)
- MAHLE 224-3673WR — OE Piston Set (STD) 2004.5–2007
FAQ
Do these include rings and pins?Yes. Each set includes matched rings, wrist pins, and clips for all six cylinders.
Are they truly “drop-in”?They are designed to drop in after professional machining to .040" over and after verifying final clearances and ring gaps.
What’s the benefit of the coatings?The thermal barrier crown helps keep heat in the chamber for improved efficiency and durability, while the ceramic skirt coating reduces friction and scuffing in high-load use.
When are .100" valve reliefs needed?If you’re running a high-lift cam and tighter piston-to-valve clearances, the .100" relief provides extra margin at RPM and temperature.
