Buick 455ci 10.5:1 Specs
Buick Buick 455ci · 4.313" × 3.9" · 10.5:1 engine specs: 455 ci (7.5L), 8-cylinder, 4.313" bore x 3.9" stroke, 10.5:1 compression.
Dimensions
| Displacement | 455 ci / 7.5 L |
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| Bore | 4.313" |
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| Stroke | 3.9" |
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| Cylinders | 8 |
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| Compression ratio | 10.5:1 |
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| Rod length | 6.607" |
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| Rod ratio | 1.694 |
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| Bore/stroke ratio | 1.106 |
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Construction
| Induction | 1-4 |
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| Advertised HP | 175–360 hp |
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| Years | 1970–1974 |
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What these numbers mean
| Bore/stroke character | 1.106 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,900 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.694 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 56.9 ci |
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| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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Cylinder head
| Chamber volume | 55.5 cc |
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| Rocker ratio | 1.55:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (18)
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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| 1970 | 360 hp | — |
| 1971 | 315 hp | — |
| 1971 | 330 hp | — |
| 1971 | 345 hp | — |
| 1972 | 225 hp | — |
| 1972 | 250 hp | — |
| 1972 | 260 hp | — |
| 1972 | 270 hp | — |
| 1973 | 225 hp | — |
| 1973 | 250 hp | — |
| 1973 | 260 hp | — |
| 1973 | 270 hp | — |
| 1974 | 175 hp | — |
| 1974 | 190 hp | — |
| 1974 | 210 hp | — |
| 1974 | 230 hp | — |
| 1974 | 245 hp | — |
| 1974 | 255 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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