Jeep 258 Specs
Jeep 258 engine specs: 258 ci (4.2L), 6-cylinder, 3.75" bore x 3.9" stroke, 9.2:1 compression.
Dimensions
| Displacement | 258 ci / 4.2 L |
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| Bore | 3.75" |
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| Stroke | 3.9" |
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| Cylinders | 6 |
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| Compression ratio | 9.2:1 |
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| Bore/stroke ratio | 0.962 |
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| Piston deck clearance | 0.022" |
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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 | 0.962 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 3,900 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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Cylinder head
| Chamber volume | 67.84 cc |
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| Rocker ratio | 1.6:1 |
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| Lifter type | hydraulic |
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Vehicles (3)
- Jeep CJ-7
- Jeep Wrangler YJ
- Jeep Cherokee SJ
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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