Ram Cummins ISB 17.3:1 Specs
Ram Cummins ISB · 4.213" × 4.882" · 17.3:1 engine specs: 408 ci (6.7L), 6-cylinder, 4.2126" bore x 4.8819" stroke, 17.3:1 compression.
Dimensions
| Displacement | 408 ci / 6.7 L |
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| Bore | 4.2126" |
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| Stroke | 4.8819" |
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| Cylinders | 6 |
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| Compression ratio | 17.3:1 |
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| Bore/stroke ratio | 0.863 |
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Construction
| Block material | cast iron |
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| Head material | cast iron |
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| Valvetrain | OHV |
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| Fuel type | diesel |
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| Advertised HP | 350–370 hp |
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What these numbers mean
| Bore/stroke character | 0.863 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 4,882 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
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| Displacement per cylinder | 68.0 ci |
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| Static compression | 17.3:1 — high enough that pump premium or better is normally required |
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Variants sharing these dimensions (2)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| — | 350 hp | 6.7L ISB, ISB 6.7, 6.7L ISB (3rd Gen) |
| — | 370 hp | ISB 6.7, ISB, 6.7L Cummins, 6.7L ISB, 6.7L ISB (4th Gen) |
Vehicles (4)
- Ram 2500
- Ram 3500
- Ram 4500
- Ram Chassis Cab
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