Product Description
MAHLE 224-3409WR.040 piston with rings for the 1994–2003 Ford 7.3L Power Stroke. Designed for 0.040" oversize bores with .010" reduced compression height for improved durability under load. Non-coated skirt, includes rings and pin/retainers. Priced as a set for (8) sold only as a full set.
- Bore (oversize): 0.040" (approx. 4.15")
- Reduced compression height: .010"
- Ring thicknesses: Top 3.00 mm, Second 2.00 mm, Oil 3.40 mm
- Piston pin OD: 33.233 mm
- Skirt coating: None (OE-style)
Fitment
- 1994–2003 Ford 7.3L Power Stroke (F-250/F-350/F-450/F-550 Super Duty, Excursion, E-Series) — see CPP fitment matrix for detailed model years.
Cross Reference & IDs
- MPN: 2243409WR040 (aka 224-3409WR.040)
- GTIN/UPC: 027067913401
- Related variants: 224-3409WR (STD), 224-3409WR.010, .020, .030
What’s Included
(8)Pistons with rings, pin, and clips (per piston). qty 8 for one engine.
FAQ
Is this the correct part for a .040" over 7.3L build?
Yes—this is the MAHLE .040" oversize piston with reduced compression height for 1994–2003 7.3L Power Stroke engines.
How many do I need?
These are priced per set of (8)pistons and sold only as a full set. 8 pieces for a complete engine.
Does the piston have a coated skirt?
No, this is a non-coated skirt piston (OE-style).
What’s the benefit of reduced compression height?
It adds margin for performance/towing builds and helps with sealing durability on boosted applications when machining and clearances are set correctly.
