Product Description
Build a stronger, cooler-running 5.9L Cummins with INDUSTRIAL INJECTION PDM-3673FCC.040 race pistons. This .040" over set is engineered for high cylinder pressure and heat with a thermal-barrier crown and low-friction skirt coating. Each kit arrives ready to install after machining, with rings, wrist pins, and clips included.
Fitment
- 2004.5–2007 Dodge Ram 2500 / 3500 5.9L Cummins (Common Rail, 24-valve)
What’s Included
- (6) Race pistons — .040" oversize
- Matched rings, wrist pins, and clips
Key Features
- Race-spec design with fly-cut valve reliefs for high-lift cams
- Thermal barrier crown helps retain heat in the chamber for efficiency
- Skirt coating reduces friction and scuffing under heavy load
- Direct replacement geometry; requires .040" overbore
Recommended Parts (CPP Internal Links)
- ARP 247-4202 Head Stud Kit (5.9L/6.7L Cummins)
- MAHLE 54557A MLS Head Gasket (03–07 5.9L)
- MAHLE HS54556 Head Set (03–07 5.9L)
Cross-Reference / Alternatives
- Industrial Injection PDM-3673CC.040 Performance Pistons (.040 Over)
- Industrial Injection PDM-3673.040 Stock Pistons (.040 Over)
Helpful Notes
- Professional machine work required. Always verify piston-to-wall clearance and ring end gaps to your build spec.
- Select MLS head gasket thickness by measuring piston protrusion after machining.
- Use new head bolts or studs and follow torque specifications precisely.
FAQ
Are these pistons drop-in?The kit includes rings, pins, and clips, but a .040" overbore and precise measurements are required before installation.
Do I need the fly-cut valve reliefs?If you run a high-lift cam or tighter piston-to-valve clearance, the reliefs provide added margin at temperature and RPM.
What coatings are used?A thermal-barrier crown helps manage heat, while a skirt coating reduces friction and scuffing in high-load use.
What supporting mods are recommended?Head studs, the correct MLS head gasket or head set, proper fueling and air supply, and careful tuning appropriate to your target power level.
