Buick 400ci 10.25:1 Specs
Buick Buick 400ci · 4.04" × 3.9" · 10.25:1 engine specs: 400 ci (6.6L), 8-cylinder, 4.04" bore x 3.9" stroke, 10.25:1 compression.
Dimensions
| Displacement | 400 ci / 6.6 L |
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| Bore | 4.04" |
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| Stroke | 3.9" |
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| Cylinders | 8 |
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| Compression ratio | 10.25:1 |
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| Rod length | 6.607" |
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| Rod ratio | 1.694 |
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| Bore/stroke ratio | 1.036 |
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| Piston deck clearance | 0.01" |
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Construction
| Induction | 1-4 |
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| Advertised HP | 340–350 hp |
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| Years | 1967–1969 |
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What these numbers mean
| Bore/stroke character | 1.036 — square — bore and stroke are within 5%, a balanced compromise |
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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 | 50.0 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
| Intake valve diameter | 2" |
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| Exhaust valve diameter | 1.63" |
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| Chamber volume | 67.6 cc |
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| Rocker ratio | 1.6:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (4)
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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| 1967 | 340 hp | — |
| 1968 | 340 hp | — |
| 1969 | 340 hp | — |
| 1969 | 350 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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