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Ford 427ci specs: 427 ci (7.0L) 8-cylinder, 4.232 x 3.784 in (107.5 x 96.1 mm) bore and stroke, 10.9:1 compression. Rated 390 hp, 1968.
The Ford 427ci is oversquare — the 4.232" bore exceeds the 3.784" stroke by 11.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.784" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.715 is in the range most production engines fall in. Each of the 8 cylinders displaces 53.4 ci (875 cc).
10.9:1 is in the range that usually runs on pump premium.
It is one of 7 engines in the Ford 427ci family, all of them 427 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 427 ci / 7 L |
|---|---|
| Bore | 4.232" |
| Stroke | 3.784" |
| Cylinders | 8 |
| Compression ratio | 10.9:1 |
| Rod length | 6.488" |
| Rod ratio | 1.715 |
| Bore/stroke ratio | 1.118 |
| Induction | 1-4 |
|---|---|
| Advertised HP | 390 hp |
| Years | 1968 |
| Bore/stroke character | 1.118 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,784 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.715 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 53.4 ci |
| Static compression | 10.9:1 — in the range that usually runs on pump premium |
| Chamber volume | 66 cc |
|---|---|
| Rocker ratio | 1.76:1 |
| Lifter type | hydraulic |
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