Chevrolet 235ci 8.25:1 Specs
Chevrolet Chevrolet 235ci · 3.563" × 3.938" · 8.25:1 engine specs: 235 ci (3.9L), 6-cylinder, 3.563" bore x 3.938" stroke, 8.25:1 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 | 8.25:1 |
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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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| Piston deck clearance | 0.014" |
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Construction
| Induction | 1-1 |
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| Advertised HP | 135–145 hp |
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| Years | 1958–1959 |
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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 | 8.25:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.88" |
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| Exhaust valve diameter | 1.505" |
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| Chamber volume | 79.1 cc |
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| Rocker ratio | 1.47:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (2)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| 1958 | 145 hp | — |
| 1959 | 135 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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