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SKU: 930036095
MAHLE Motorsport Duramax Pistons – 6.6L L5P/L5D 4.095" Bore, 17:1 CR, -41.8cc Dish (Set of 8)
The MAHLE 930036095 is the #1 selling performance/repair piston set for 2017–2025 GM Duramax 6.6L L5P (Silverado/Sierra 2500HD-3500HD). These forged 2618-alloy pistons feature a 4.095" (+0.020") overbore, 17:1 compression ratio, deep -41.8cc dish, and are designed for stock 3.898" stroke / 6.417" rod length. Perfect for built engines, big single/compound turbo setups, or fixing a dropped valve includes rings, pins, and clips.
Key Features
- Forged 2618 Aluminum Alloy – proven to 1500+ HP
- 4.095" Bore (+0.020" over) – cleans up damaged cylinders
- 17:1 Compression Ratio (-41.8cc dish) – safe for big injectors & nitrous
- Graphite-Coated Skirts + Phosphate Coating – instant break-in & wear protection
- Full Set of 8 – includes premium MAHLE rings, pins, clips
Product Notes
- Fits all 2017–2025 Duramax 6.6 L5P (and 2020+ L5D in medium-duty)
- Requires 4.095" bore (machine block 0.020" over)
Installation Notes
- Requires engine machining – 4.095" final bore & decking
- Recommended clearance: 0.0045–0.0050"
- Use with stock or aftermarket connecting rods (6.417" length)
This Part Fits
| Year | Make | Model | Engine |
|---|---|---|---|
| 2017–2025 | Chevrolet | Silverado 2500HD / 3500HD | 6.6L Duramax L5P |
| 2017–2025 | GMC | Sierra 2500HD / 3500HD | 6.6L Duramax L5P |
| 2020–2025 | Chevy/GMC | Medium Duty | 6.6L L5D |
Why Choose MAHLE Motorsport?
- Official OE supplier to GM for GM Duramax – these are the same forgings used in factory race programs
- Used by every 1500+ hp Duramax drag & sled-pull truck
- Lifetime warranty against defects when properly installed
Frequently Asked Questions
-
Q: Can I run these on a stock turbo daily driver?
A: Yes, 17:1 is safe and actually improves low-end response. -
Q: Do they drop compression too much?
A: No, 17:1 is the sweet spot for 1000–1800 hp builds. -
Q: Are rings gapped for boost/nitrous?
A: Yes, factory pre-gapped for 1200+ hp.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Official MAHLE Motorsport box (set of 8)
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