Jeep 40 AMC I6 HO Specs
Jeep 40 AMC I6 HO engine specs: 242 ci (4L), 6-cylinder, 3.874" bore x 3.4134" stroke, 8.8:1 compression.
Dimensions
| Displacement | 242 ci / 4 L |
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| Bore | 3.874" |
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| Stroke | 3.4134" |
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| Cylinders | 6 |
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| Compression ratio | 8.8:1 |
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| Bore/stroke ratio | 1.135 |
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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 | 190 hp |
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What these numbers mean
| Bore/stroke character | 1.135 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
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| Displacement per cylinder | 40.3 ci |
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| Static compression | 8.8:1 — low by modern standards, generally happy on regular pump fuel |
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