Jeep 258 Specs
Jeep 258 engine specs: 258 ci (4.2L), 6-cylinder, 3.75" bore x 4" stroke, 9.2:1 compression.
Dimensions
| Displacement | 258 ci / 4.2 L |
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| Bore | 3.75" |
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| Stroke | 4" |
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| Cylinders | 6 |
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| Compression ratio | 9.2:1 |
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| Bore/stroke ratio | 0.938 |
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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 | gas |
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| Advertised HP | 112 hp |
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What these numbers mean
| Bore/stroke character | 0.938 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 43.0 ci |
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| Static compression | 9.2:1 — low by modern standards, generally happy on regular pump fuel |
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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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| — | 112 hp | 258 |
| — | 112 hp | 258 |
Vehicles (4)
- Jeep CJ
- Jeep Cherokee (SJ)
- Jeep Wrangler (YJ)
- Jeep CJ-7
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