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Buick 430ci specs: 430 ci (7.0L) 8-cylinder, 4.185 x 3.90 in (106.3 x 99.1 mm) bore and stroke, 10.25:1 compression. Rated 360 hp, 1967–1969.
The Buick 430ci is oversquare — the 4.185" bore exceeds the 3.9" stroke by 7.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.9" stroke puts mean piston speed at 4,000 ft/min around 6,150 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.694 is in the range most production engines fall in. Each of the 8 cylinders displaces 53.8 ci (881 cc).
10.25:1 is in the range that usually runs on pump premium.
3 factory variants share these dimensions, rated at 360 hp across 1967–1969.
| Displacement | 430 ci / 7 L |
|---|---|
| Bore | 4.185" |
| Stroke | 3.9" |
| Cylinders | 8 |
| Compression ratio | 10.25:1 |
| Rod length | 6.607" |
| Rod ratio | 1.694 |
| Bore/stroke ratio | 1.073 |
| Piston deck clearance | 0.01" |
| Induction | 1-4 |
|---|---|
| Advertised HP | 360 hp |
| Years | 1967–1969 |
| Bore/stroke character | 1.073 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,900 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.694 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 53.8 ci |
| Static compression | 10.25:1 — in the range that usually runs on pump premium |
| Intake valve diameter | 2" |
|---|---|
| Exhaust valve diameter | 1.63" |
| Chamber volume | 67.6 cc |
| Rocker ratio | 1.6:1 |
| Lifter type | hydraulic |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1967 | 360 hp | — |
| 1968 | 360 hp | — |
| 1969 | 360 hp | — |