Product Description
MAHLE 224-3666WR-0.75MM piston kit with rings for the 2008–2010 Ford 6.4L Power Stroke (VIN “R”). This .75 mm (≈0.030") overbore set features coated skirts and the correct RFK13PF ring pack for fast seating, tight oil control, and OE-level durability in tow, work, or daily duty cycles.
Built on MAHLE’s OE heritage, these aluminum pistons maintain stable geometry and excellent scuff resistance under heat and load—ideal for clean, reliable power on your 6.4L rebuild.
Fitment
- 2008, 2009, 2010 Ford Super Duty F-250 / F-350 / F-450 / F-550 with 6.4L Power Stroke (VIN “R”)
- Oversize: .75 mm (≈0.030") • Bore: ≈3.895"
- Sold as a complete set of eight (8) pistons with rings, pins, and retainers
Cross-Reference / Alternatives (Mahle on CPP Diesel only)
- Standard bore: MAHLE 224-3666WR (STD)
- +0.25 mm: MAHLE 224-3666WR-0.25MM
- +0.50 mm (.020"): MAHLE 224-3666WR-0.50MM
- Related 6.4L designs: MAHLE 224-3851WR-0.75MM (MaxxForce 7), MAHLE 224-3953WR-0.75MM (Reduced Compression)
Specifications for Mahle 224-3666WR-0.75MM
| Attribute | Value |
|---|---|
| Brand | MAHLE Original |
| Part Number | 224-3666WR-0.75MM |
| UPC | 027067927415 |
| GTIN | 027067927415 |
| Engine | Ford 6.4L Power Stroke V8 (VIN “R”) |
| Oversize / Bore | .75 mm over (≈0.030"); ≈3.895" bore |
| Ring Pack | RFK13PF |
| Includes | (8) pistons, rings, pins & retainers |
| Shipping | Free Ground Shipping (options shown at checkout) |
| 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 price for one piston or all eight?
The price on this CPP Diesel page is for a complete set of eight (8) pistons with rings, pins, and retainers.
Will these fit my 2008–2010 6.4L Power Stroke?
Yes—these fit 2008–2010 Ford Super Duty models with the 6.4L Power Stroke (VIN “R”). Always verify bore size and machine work requirements.
What does .75 mm over mean for my build?
It’s approximately 0.030" over stock. Your cylinders must be bored/honed to this size and ring gaps set to MAHLE specification.
Are rings and pins included?
Yes—each piston includes a matched RFK13PF ring set, plus pins and retainers.
