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Lexus 3UR-FE specs: 5.7L (346 ci) 8-cylinder, 94 x 102 mm (3.7008 x 4.0157 in) bore and stroke. Rated 381 hp, 2007–2021. Used in the Toyota Tundra. DOHC.
The Lexus 3UR-FE is undersquare — the 4.0157" stroke exceeds the 3.7008" bore by 7.8% — a layout that trades peak RPM for leverage and torque low in the range. The 4.0157" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 43.3 ci (709 cc).
It is one of 10 engines in the UR family, the largest at 346 ci. 15 factory variants share these dimensions, rated at 381 hp across 2007–2021.
| Displacement | 346 ci / 5.7 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 4.0157" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 0.922 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 381 hp |
| Years | 2007–2021 |
| Bore/stroke character | 0.922 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,016 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.3 ci |
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 |
|---|---|---|
| 2007 | 381 hp | 3UR-FE |
| 2008 | 381 hp | 3UR-FE |
| 2009 | 381 hp | 3UR-FE |
| 2010 | 381 hp | 3UR-FE |
| 2011 | 381 hp | 3UR-FE |
| 2012 | 381 hp | 3UR-FE |
| 2013 | 381 hp | 3UR-FE |
| 2014 | 381 hp | 3UR-FE |
| 2015 | 381 hp | 3UR-FE |
| 2016 | 381 hp | 3UR-FE |
| 2017 | 381 hp | 3UR-FE |
| 2018 | 381 hp | 3UR-FE |
| 2019 | 381 hp | 3UR-FE |
| 2020 | 381 hp | 3UR-FE |
| 2021 | 381 hp | 3UR-FE |