Product Description
Step up your 6.6L Duramax bottom end with INDUSTRIAL INJECTION’s .040” oversize race cast pistons. These de-lipped, fly-cut pistons feature a thermal barrier crown and ceramic skirt coating to handle heat, load, and sustained cylinder pressure in high-fuel/boost builds.
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
Specs & Highlights
- .040" oversize (4.095" bore) race cast piston set
- De-lipped bowl and fly-cut valve reliefs
- Thermal barrier top coating to keep heat in the chamber
- Ceramic skirt coating to reduce friction and scuffing
- Built for nitrous, supercharged, or turbocharged performance use
What’s Included
- (8) .040" oversize race cast pistons with coated tops & skirts
Recommended Parts (CPP internal links)
- ARP 230-4201 Head Stud Kit (01–16 Duramax)
- MAHLE 41909.04 Piston Ring Set (.040) — 2001–2010
- MAHLE 42160.04 Piston Ring Set (.040) — 2011–2016
- Total Seal S9091-40 Gapless 2nd Ring Set (4.095")
- S&S LML CP3 Conversion Kit w/ Pump — 2011–2016
- Shop All Duramax Studs & Bolts
- Shop All Duramax Pistons & Rings
Cross-Reference / Alternatives
Helpful Notes
- Professional machine work required for .040" overbore; verify piston-to-wall clearance and ring end gaps.
- Match head gasket thickness and valve reliefs to your cam and target compression.
- LML builds pushing fuel/boost often benefit from a CP3 conversion for reliability.
FAQ
Do these pistons include rings?No. Pistons are supplied without rings; choose MAHLE or Total Seal .040" ring sets above to match your year/bore.
What coatings are applied?Thermal barrier coating on the crown to manage heat, and a ceramic skirt coating to reduce friction under high load.
Are they suitable for high-lift cams?Yes—these are fly-cut race pistons. Always check piston-to-valve clearance for your cam profile and gasket stack.
What supporting mods are recommended?Head studs, proper ring pack, and fuel system upgrades (e.g., CP3 conversion on LML) are strongly recommended for high-power use.
