Oldsmobile 394ci 10.25:1 Specs
Oldsmobile Oldsmobile 394ci · 4.124" × 3.688" · 10.25:1 engine specs: 394 ci (6.5L), 8-cylinder, 4.124" bore x 3.688" stroke, 10.25:1 compression.
Dimensions
| Displacement | 394 ci / 6.5 L |
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| Bore | 4.124" |
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| Stroke | 3.688" |
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| Cylinders | 8 |
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| Compression ratio | 10.25:1 |
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| Rod length | 7" |
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| Rod ratio | 1.898 |
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| Bore/stroke ratio | 1.118 |
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Construction
| Induction | 1-4 |
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| Advertised HP | 280 hp |
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| Years | 1964 |
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What these numbers mean
| Bore/stroke character | 1.118 — 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 | 49.3 ci |
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| Static compression | 10.25:1 — in the range that usually runs on pump premium |
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Cylinder head
| Chamber volume | 70.9 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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