Oldsmobile 371ci 9.75:1 Specs
Oldsmobile Oldsmobile 371ci · 4" × 3.688" · 9.75:1 engine specs: 371 ci (6.1L), 8-cylinder, 4" bore x 3.688" stroke, 9.75:1 compression.
Dimensions
| Displacement | 371 ci / 6.1 L |
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| Bore | 4" |
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| Stroke | 3.688" |
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| Cylinders | 8 |
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| Compression ratio | 9.75:1 |
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| Rod length | 7" |
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| Rod ratio | 1.898 |
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| Bore/stroke ratio | 1.085 |
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Construction
| Induction | 1-2 |
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| Advertised HP | 270 hp |
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| Years | 1959 |
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What these numbers mean
| Bore/stroke character | 1.085 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,688 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.898 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 46.4 ci |
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| Static compression | 9.75:1 — in the range that usually runs on pump premium |
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Cylinder head
| Chamber volume | 79 cc |
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| Rocker ratio | 1.8:1 |
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| Lifter type | hydraulic |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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