Chevrolet 235ci 7.5:1 Specs
Chevrolet Chevrolet 235ci · 3.563" × 3.938" · 7.5:1 engine specs: 235 ci (3.9L), 6-cylinder, 3.563" bore x 3.938" stroke, 7.5:1 compression.
Dimensions
| Displacement | 235 ci / 3.9 L |
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| Bore | 3.563" |
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| Stroke | 3.938" |
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| Cylinders | 6 |
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| Compression ratio | 7.5:1 |
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| Rod length | 6.813" |
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| Rod ratio | 1.73 |
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| Bore/stroke ratio | 0.905 |
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Construction
| Induction | 1-1 |
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| Advertised HP | 123 hp |
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| Years | 1955 |
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What these numbers mean
| Bore/stroke character | 0.905 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 3,938 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.73 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 39.2 ci |
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| Static compression | 7.5:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Chamber volume | 85.9 cc |
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| Rocker ratio | 1.47:1 |
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| Lifter type | mechanical |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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