See other engines in this family
Ford Godzilla specs: 445 ci (7.3L) 8-cylinder, 4.221 x 3.976 in (107.2 x 101 mm) bore and stroke, 10.5:1 compression. Rated 335-430 hp. OHV.
The Ford Godzilla is oversquare — the 4.2205" bore exceeds the 3.9764" stroke by 6.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.9764" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 55.6 ci (912 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 2 engines in the Godzilla family, all of them 445 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated from 335 to 430 hp. Factory fitments include the Ford F-250 Super Duty, Ford F-350 Super Duty, Ford F-450 Super Duty and 6 others.
| Displacement | 445 ci / 7.3 L |
|---|---|
| Bore | 4.2205" |
| Stroke | 3.9764" |
| Cylinders | 8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.061 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 335–430 hp |
| Bore/stroke character | 1.061 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,976 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 55.6 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 335 hp | 7.3L V8 F-650/F-750 |
| — | 350 hp | 7.3L V8 F53/F59 |
| — | 385 hp | 7.3L V8 F-650/F-750 (High Output) |
| — | 430 hp | 7.3L V8 |