Product Description
INDUSTRIAL INJECTION PDM-362.040 Duramax Race Pistons are purpose-built for high-horsepower 6.6L builds. The .040" overbore increases cylinder diameter for fresh wall finish and precise piston-to-wall clearances, supporting tighter ring seal and durability under elevated cylinder pressures. Ideal for compounds, larger single turbos, and tuned competition applications when paired with proper fueling and machine work.
- .040" overbore (PDM-362.040) for 6.6L GM Duramax
- Race-oriented crown and ring land geometry to support high boost and heat
- Designed for professional machine-shop installation and blueprinting
- Sold as a set; rings/pins availability varies by configuration - see Recommended Parts below
Fitment
GM 6.6L Duramax (2001-2016):
- LB7 (2001-2004)
- LLY (2004.5-2005)
- LBZ (2006-2007)
- LMM (2007.5-2010)
- LML (2011-2016)
Specifications
| Manufacturer | Industrial Injection |
|---|---|
| Part Number | PDM-362.040 |
| Overbore Size | .040" (1.016 mm) over |
| Engine | 6.6L Duramax (LB7/LLY/LBZ/LMM/LML) |
| Set/Quantity | Set (Qty depends on configuration; typically 8 for V8) |
| UPC | - (TBD by manufacturer) |
| GTIN | - (TBD by manufacturer) |
| Prop 65 | Yes - California Proposition 65 warning |
Recommended Parts
- Piston Ring Set, .040" Over: Shop .040" Duramax rings
- Wrist Pins/Retainers (If not included): Duramax wrist pins
- MLS Head Gasket Set: Head gaskets & seal kits
- Main & Rod Bearings: Engine bearings
- Head Studs (Recommended for high boost): Duramax head studs
- Machine Shop Services: Block prep & machining
Installation Notes
- Professional measurement and honing to piston manufacturer's clearance spec are required.
- Always verify compression height, bowl style, valve reliefs, and intended compression ratio for your build.
- Ring end-gaps must be set for the power level, fuel, and intended use.
Why Buy From CPP Diesel
- Duramax build experts with real-world race and towing experience
- Fast shipping & responsive support
- Huge in-stock selection to complete your long block
FAQs
Do these pistons include rings and wrist pins?Availability varies by batch and configuration. If rings and pins are not included, add a compatible .040" ring set and wrist pins from our rings and pins selection.
What compression ratio will I have with these pistons? Compression ratio depends on piston bowl design, head gasket thickness, deck height, and chamber volume. Consult your machine shop and tuner before ordering gaskets and verifying deck specs.
Is .040" over safe for a street or towing build? Yes, when machined to spec and tuned properly. For heavy towing in extreme heat, pair with quality cooling, head studs, and a conservative tune.
Do I need to modify my tune when installing race pistons? Yes. A custom calibration is strongly recommended to account for piston design, ring pack, and intended power level.
Will these fit my LB7/LLY/LBZ/LMM/LML without other changes? Physical fitment is for 2001-2016 6.6L Duramax blocks, but every build should be measured and blueprinted. Verify bowl style and compression details with your builder.
Note: Images are representative. Final appearance/specs may vary by production run. Always confirm details prior to machine work.
