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Toyota 3UZ-FE specs: 4.3L (258 ci) 8-cylinder, 91 x 82.5 mm (3.5827 x 3.2480 in) bore and stroke, 10.5:1 compression. Rated 300 hp. DOHC.
The Toyota 3UZ-FE is oversquare — the 3.5827" bore exceeds the 3.248" stroke by 10.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.248" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 32.3 ci (528 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 7 engines in the UZ V8 family, sitting between the 242 ci and 284.6 ci members. Factory fitments include the Lexus LS 430, Lexus GS 430, Lexus SC 430 and 1 other.
| Displacement | 258 ci / 4.3 L |
|---|---|
| Bore | 3.5827" |
| Stroke | 3.248" |
| Cylinders | 8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.103 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 300 hp |
| Bore/stroke character | 1.103 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,248 ft/min — conservative for a street engine |
| Displacement per cylinder | 32.3 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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