Ram 67 Cummins ISB HO Specs
Ram 67 Cummins ISB HO engine specs: 408 ci (6.7L), 6-cylinder, 4.2126" bore x 4.8819" stroke, 16.2:1 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 | 16.2:1 |
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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 | 400 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 | 16.2:1 — high enough that pump premium or better is normally required |
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