Product Description
Strengthen your 5.9L Cummins short block with INDUSTRIAL INJECTION PDM-3673FCC.020 race pistons (.020" over). Built for high boost and heat, these coated, de-lipped pistons help manage cylinder temps and reduce skirt friction for reliable power in towing, street/strip, and competition builds.
Fitment
- 2004.5–2007 Dodge Ram 2500/3500 5.9L Cummins (Common-Rail) — .020" overbore required
What’s Included
- (6) Race pistons — .020" oversize
- Rings, wrist pins, and clips
Key Features
- Race-ready bowl design (de-lipped) for added strength under high cylinder pressure
- Thermal barrier crown coating to help keep heat in the chamber
- Low-friction skirt coating to reduce scuffing in hard use
- Optional fly-cut valve reliefs for high-lift camshaft setups
- Direct replacement set; machine block for .020" over
Recommended Parts (CPP Internal Links Only)
- ARP 247-4202 Head Stud Kit — 5.9L/6.7L Cummins
- MAHLE HS54557C Head Set — 2003–2007 5.9L
- 5.9L Cummins Piston Ring Set (spares)
- Performance Camshafts & Valvetrain
- Shop All Cummins Pistons & Rings
Helpful Notes
- Professional machine work required — confirm piston-to-wall clearance and ring end gaps to your build spec.
- Choose valve reliefs and head gasket thickness to match cam lift, piston protrusion, and target compression.
FAQ
Do these pistons drop in without machining?No. They are .020" oversize and require a precise overbore/hone and clearance verification.
Are valve reliefs required?Not for stock cams. High-lift aftermarket cams or tight piston protrusion may benefit from fly-cut reliefs for added piston-to-valve clearance.
What coatings are used?A thermal barrier crown coating helps manage heat, while a skirt coating reduces friction and scuffing under high load.
What supporting mods do you recommend?Head studs, correct head gaskets, adequate fuel supply, and careful tuning. Consider upgraded valve springs/retainers with big cams.
