Product Description
Build a harder-hitting 5.9L common-rail with INDUSTRIAL INJECTION Race Fly-Cut, Coated & Chamfered pistons (.020" over). Designed for high cylinder pressure and heat, these MAHLE-based pistons include thermal crown and skirt coatings, fly-cut valve reliefs, and chamfered edges for durability under aggressive fuel and air.
Fitment
- 2003–2004 RAM 2500/3500 5.9L Cummins 24-Valve (Common Rail)
What’s Included
- Complete set of six (.020" oversize) pistons
- Matched rings, wrist pins, and locks/clips
- Race prep: fly-cut valve reliefs, thermal crown coating, skirt coating, chamfered edges
Key Features
- .020" overbore for fresh cylinder finish and tighter control
- Fly-cut valve reliefs to support high-lift camshafts
- Thermal barrier crown helps keep heat in the chamber for efficiency
- Low-friction skirt coating to reduce scuffing under load
- Chamfered to mitigate cylinder wall contact at operating temp
Recommended Parts (CPP internal links only)
- ARP 247-4202 Head Stud Kit — 5.9L/6.7L Cummins
- MAHLE HS54557A Upper Head Set — 2003–2007 5.9L
- CP3 Injection Pumps — Stock to 14mm (’03–’07)
- Pistons & Rings Category — 5.9L/6.7L Cummins
- Rod & Main Bearings — 5.9L Cummins
Helpful Notes
- Professional machine work is required for .020" overbore; verify piston-to-wall clearance and ring end gaps per spec.
- Confirm piston bowl/reliefs with your cam profile, gasket thickness, and intended boost/EGT levels.
FAQ
Are these a true “drop-in” set?The set includes rings, pins, and clips, but a .020" overbore and precise clearances are required. Always measure and set ring gaps to your build.
What does “FCC” mean on these pistons?FCC indicates Race Fly-Cut, Coated & Chamfered prep — valve reliefs, thermal crown and skirt coatings, and chamfering for high-load use.
Do I need valve reliefs with a stock cam?They’re designed to accommodate higher-lift cams and tight P-to-V builds. With a stock cam, reliefs add margin; always check clearance.
Which supporting mods pair best with these pistons?Head studs, correct MLS head gasket, adequate fuel supply (CP3 upgrades for power goals), and careful tuning.
