Product Description
MAHLE 224-3666WR-0.25MM is a .25 mm oversize piston kit with rings for the 2008–2010 Ford 6.4L Power Stroke. Coated skirts and OE-grade construction deliver quiet operation and long life. PRICE ON THIS CPP DIESEL LISTING IS FOR A COMPLETE SET OF (8) PISTONS WITH RINGS
- Application: 6.4L Power Stroke (VIN “R”)
- Size: .25 mm oversize (~.010")
- Bore: 3.876" • Compression height: 0.151" • Width: 0.098"
- Ring type code: RFK13PF
- Skirt: Graphite/moly coating to reduce friction
Fitment
- 2008–2010 Ford Super Duty F-250 / F-350 / F-450 / F-550, 6.4L Power Stroke
- 2008–2010 Ford E-Series (E-250 / E-350 / E-450) with 6.4L diesel
Cross Reference / IDs
- MAHLE / Clevite: 224-3666WR-0.25MM (this item), 224-3666WR (STD), 224-3666WR-0.50MM, 224-3666WR-0.75MM (alt sizes)
- Ford OE piston & pin assemblies (verify size): 8C3Z-6108-EB, 8C3Z-6108-CB
- UPC/GTIN: 027067928832
- XDP SKU: MCI224-3666WR-0.25MM
What’s Included
(8) pistons with rings (.25 mm oversize). Use with proper machine finish and clearances per Ford/International specs.
FAQ
Will this fit my 6.4L?
Yes—fits 2008–2010 Ford 6.4L Power Stroke (Super Duty and E-Series shown above).
Is this price per piston or a full set?
Our CPP Diesel price is for the FULL SET of eight pistons with rings.
What size is “.25 mm” in inches?
Approx. .010" over standard.
Do I need machine work?
Yes—confirm bore size, finish (RA), and piston-to-wall clearance. Hone/measure to spec for MLS gasket sealing and ring seating.
What rings are included?
MAHLE ring pack matched to these pistons (RFK13PF code).
