Home › Engine comparisons › 6.7 Cummins vs 6.7 Power Stroke6.7 Cummins vs 6.7 Power Stroke: What's the Difference?
The Cummins 6.7L ISB and the Ford 6.7L Power Stroke differ in displacement, bore × stroke, cylinders, compression ratio. The table puts the factory specs side by side; each engine's own page has the full specs.
Specs side by side
Cummins 6.7L ISB Ford 6.7L Power Stroke Engine Cummins 6.7L ISB (Ram) Ford 6.7L Power Stroke (Scorpion) Displacement 408.3 ci (6.69 L) 406.2 ci (6.66 L) Bore × stroke 4.213" × 4.882" 3.900" × 4.250" Cylinders 6 8 Compression ratio 16.2:1–17.3:1 15.8:1–16.2:1 Factory rating 350 hp–430 hp 390 hp–500 hp Block cast iron compacted graphite iron Heads cast iron aluminum Rod length — — Deck height — — Weight (approx.) 1150 lb 970 lb–1100 lb Fuel diesel diesel Model years 2007–2026 2011–2026
Where versions of an engine differ, the table shows the range across them. Ratings are the makers' published figures.
Other differences
Cummins 6.7L ISB Ford 6.7L Power Stroke Factory recall (Cummins CP4) NHTSA 21V-880: 2019-2020 Ram 2500/3500 pickups and 3500-5500 cab chassis with 6.7L Cummins - high pressure fuel pump may fail and stall the engine -- Other factory recalls (Cummins 6.7) 08V-641 (2007-08 Ram 2500/3500: silencer pad can contact EGR cooler); 15V-592 (2016: ECM short circuit stall); 17V-562 (2013-17: Concentric water pump without vent hole); 20V-511 and 21V-439 (2019-20 Ram 3500-5500 cab chassis HO: rod-bearing warm-up protection / low oil warning); 22V-642 (2022: ECM capacitor) -- Factory recall (Power Stroke 6.7) -- 13V-535: 2011-2012 F-350/450/550 Ambulance Package with 6.7L diesel - exhaust sensor problem may cause loss of power and stall
Which cars got each engine
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