Product Description
MAHLE 224-3666WR-0.25MM piston kit with rings for the 2008–2010 Ford 6.4L Power Stroke (VIN R). This +0.25 mm (+0.010") oversize set features coated skirts for reduced friction, OE-style bowl geometry, and a factory-matched ring pack for quiet operation, strong sealing, and long service life.
Fitment
- 2008–2010 Ford Super Duty F-250 / F-350 / F-450 / F-550 — 6.4L Power Stroke (VIN R)
- 2008–2010 Ford E-Series (E-250 / E-350 / E-450) — 6.4L diesel
- Sold as a complete set of 8 pistons with rings, pins & retainers
Cross-Reference / Alternatives (MAHLE on CPP Diesel only)
- Standard bore: MAHLE 224-3666WR (STD)
- +0.50 mm (.020"): MAHLE 224-3666WR-0.50MM
- +0.75 mm (.030"): MAHLE 224-3666WR-0.75MM
- Reduced-compression family (STD): MAHLE 224-3953WR (STD, reduced compression)
- MaxxForce 7 family (STD): MAHLE 224-3851WR (STD)
Specifications for Mahle 224-3666WR-0.25MM
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | 224-3666WR-0.25MM |
| UPC | 027067928832 |
| GTIN | 00027067928832 |
| Engine | Ford 6.4L Power Stroke (VIN R) |
| Oversize | +0.25 mm (+0.010") |
| Bore (approx.) | ≈ 3.876" |
| Ring Pack | MAHLE RFK13PF (matched) |
| Skirt Coating | Graphite/Moly friction-reducing coat |
| Includes | (8) pistons, rings, pins & retainers |
| Shipping | Free Ground Shipping (rates 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 the price per piston or for a full set?
CPP Diesel lists this as a complete set of 8 pistons with rings, pins, and retainers.
What overbore size is .25 mm in inches?
Approximately .010" over standard. Machine and hone the block to spec and verify piston-to-wall clearance.
Will these fit my 2008–2010 Super Duty?
Yes—fits 6.4L Power Stroke (VIN R) in 2008–2010 Super Duty trucks and 2008–2010 E-Series applications as listed above.
Do the rings come pre-installed?
Rings are included and should be checked/gapped and installed during assembly per MAHLE procedure.
