Product Description
Step up your 6.6L Duramax build with INDUSTRIAL INJECTION’s forged MAHLE race pistons in .040” oversize. Purpose-built for high boost and heat, these de-lipped, fly-cut pistons use PDM thermal-barrier crown and low-friction skirt coatings to survive extreme cylinder pressures. Includes rings, wrist pins, and clips for a pro-level rebuild.
Fitment
- 2001–2004 LB7 6.6L Duramax
- 2004.5–2005 LLY 6.6L Duramax
- 2006–2007.5 LBZ 6.6L Duramax
- 2007.5–2010 LMM 6.6L Duramax
- 2011–2016 LML 6.6L Duramax
What’s Included
- (8) Forged MAHLE pistons — .040” oversize
- Matched rings, wrist pins, and clips
Key Features
- Forged race construction with de-lipped bowls for strength under high boost
- Thermal-barrier crown coating to retain heat in the chamber and improve efficiency
- Skirt coating to reduce friction and scuffing under load
- Fly-cut valve reliefs option (.100") for high-lift cams
- Direct replacement set; machining required for .040” overbore
Recommended Parts (CPP Internal Links)
- ARP 230-4201 Head Stud Kit (01–16 Duramax)
- S&S Diesel LML CP3 Conversion Kit — No Tuning Required (2011–2016)
- Shop All Duramax Pistons & Rings
- Need less bore? PDM-362.020 (.020 Over) Alternative
- Standard Bore Option: PDM-362STD
Helpful Notes
- Professional machine work required for .040” overbore—verify piston-to-wall clearance and ring end gaps.
- Match compression ratio, head gasket thickness, and valve reliefs to your cam and intended power level.
- For 2011–2016 LML builds increasing fueling, a CP3 conversion improves reliability under load.
FAQ
Are these pistons “drop-in”?The set includes rings, pins, and clips, but an overbore (.040”) and precise machine measurements are required for proper clearances.
Do I need the .100" valve relief option?Recommended if you run a high-lift cam or tight piston-to-valve clearance to ensure proper margin at temperature and RPM.
What coatings are used?Thermal-barrier crown and low-friction skirt coatings help manage heat and reduce scuffing in high-load competition use.
Which supporting mods pair best with these pistons?Head studs, correct head gaskets, ample fuel supply, quality tuning, and (for LML) a CP3 conversion when power is increased significantly.
