Product Description
MAHLE 224-3953WR-0.50MM reduced-compression piston set with rings for the 2008–2010 Ford 6.4L Power Stroke (VIN R) and Navistar MaxxForce 7. The .50 mm oversize design supports proper piston-to-wall clearance after machine work, while the reduced compression height and coated skirts help mitigate the common cracking issues seen on stock pistons under heavy load and higher EGTs.
Fitment
- 2008, 2009, 2010 Ford F-250 / F-350 / F-450 / F-550 6.4L Power Stroke (VIN R)
- Navistar MaxxForce 7 (applicable 2008–2010 configurations)
- Oversize: +0.50 mm (.020") — requires proper boring/honing and verification to MAHLE spec
- Sold as a complete engine set of 8 pistons with matched rings, pins & retainers (as supplied by MAHLE)
Why builders choose 224-3953WR-0.50MM
- Reduced compression height to better manage peak cylinder pressure
- OE-grade skirt coating for scuff resistance and stable break-in
- Factory-matched ring pack for reliable sealing and oil control
Cross-Reference / Alternatives (MAHLE on CPP Diesel)
- Standard bore (STD): MAHLE 224-3953WR (STD)
- +0.75 mm oversize: MAHLE 224-3953WR-0.75MM
- OE-style compression family (STD) for 6.4L: MAHLE 224-3666WR-0.50MM
Specifications for Mahle 224-3953WR-0.50MM
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | 224-3953WR-0.50MM |
| UPC | 027067992451 |
| GTIN | 00027067992451 |
| Engine Compatibility | 2008–2010 Ford 6.4L Power Stroke (VIN R); Navistar MaxxForce 7 |
| Oversize | +0.50 mm (.020") |
| Set Size | 8 pistons (complete engine set) |
| Includes | Pistons, matched rings, pins & retainers (as supplied by MAHLE) |
| Skirt | Graphite/moly coated |
| Shipping | Free Shipping (where applicable) |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Learn more. |
FAQ
Is this a full set or priced per piston?
CPP Diesel sells this as a complete set of eight (8) pistons with rings.
What does “reduced compression” mean for my build?
These pistons use a slightly lower compression height to help manage peak cylinder pressure and heat—an upgrade commonly used to address factory 6.4L piston issues.
Will +0.50 mm work in my block?
Yes—after professional boring/honing to the correct finish and clearances. Always measure each cylinder and verify to MAHLE specifications before ordering.
Do the rings come pre-installed?
The rings are included but must be gapped and installed during assembly.
