Product Description
MAHLE 224-3802.020 is a .020" oversize, QSB-style marine bowl piston kit for the 2007.5–2018 Cummins 6.7L ISB. Sold as a matched set of 6 pistons (pins/clips as supplied by MAHLE). Price shown is for a full set of six pistons. Use matching .020 ring sets (see recommendations).
- Bowl: Marine/QSB style (popular for 5.9-style spray pattern conversions)
- Bore size: 107 mm (4.210") — +.020" over
- Application: 6.7L ISB/QSB (automotive & industrial)
- Rings: Not included — order .020 rings separately
Fitment
- 2007.5–2018 Dodge/Ram 2500, 3500, 4500, 5500 with 6.7L Cummins (ISB 24V)
- Also used in certain QSB 6.7 industrial/marine applications where specified
Cross Reference Numbers
- Cummins: 4376348 (Engine Piston Kit, .020" oversize); related STD kit 4376345
- MAHLE Rings: S42140.020 (.020" over), S42140 (STD)
What’s Included
Six (.020" over) marine-bowl pistons with pins/clips as provided by MAHLE. Ring sets sold separately.
Install Notes
- Confirm cylinder wear/out-of-round; hone or bore to MAHLE/Cummins spec for .020" oversize
- Verify spray pattern/injector match if performing a QSB-bowl conversion
FAQ
Is the listed price for one piston or a set?
The price is for a set of 6 pistons (full engine set).
Do these include piston rings?
No. Order MAHLE S42140.020 ring sets (.020" over) separately.
What vehicles does this fit?
2007.5–2018 Ram 2500/3500/4500/5500 with the 6.7L Cummins ISB; also used in specified QSB 6.7 applications.
What’s the bore size?
107 mm (4.210") — .020" oversize for properly machined blocks.
