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Ford 363ci specs: 363 ci (5.9L) 8-cylinder, 4.125 x 3.40 in (104.8 x 86.4 mm) bore and stroke, 11.5:1 compression. Rated 330 hp, 2013.
The Ford 363ci is oversquare — the 4.125" bore exceeds the 3.4" stroke by 21.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. A rod ratio of 1.588 is in the range most production engines fall in. Each of the 8 cylinders displaces 45.4 ci (744 cc).
11.5:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
| Displacement | 363 ci / 5.9 L |
|---|---|
| Bore | 4.125" |
| Stroke | 3.4" |
| Cylinders | 8 |
| Compression ratio | 11.5:1 |
| Rod length | 5.4" |
| Rod ratio | 1.588 |
| Bore/stroke ratio | 1.213 |
| Piston deck clearance | 0" |
| Advertised HP | 330 hp |
|---|---|
| Years | 2013 |
| Bore/stroke character | 1.213 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,400 ft/min — conservative for a street engine |
| Rod ratio | 1.588 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 45.4 ci |
| Static compression | 11.5:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.02" |
|---|---|
| Exhaust valve diameter | 1.6" |
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