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Ford EcoBoost 3.5 specs: 213.4 ci (3.5L) 6-cylinder, 3.642 x 3.413 in (92.5 x 86.7 mm) bore and stroke. Rated 365-400 hp, 2011–2026. Used in the Ford F-150.
The Ford EcoBoost 3.5 is oversquare — the 3.6417" bore exceeds the 3.4134" stroke by 6.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.4134" 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. Each of the 6 cylinders displaces 35.6 ci (583 cc).
It is one of 24 engines in the EcoBoost family, the largest at 213.4 ci. 21 factory variants share these dimensions, rated from 365 to 400 hp across 2011–2026.
| Displacement | 213.4 ci / 3.5 L |
|---|---|
| Bore | 3.6417" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.067 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 365–400 hp |
| Years | 2011–2026 |
| Bore/stroke character | 1.067 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.6 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 |
|---|---|---|
| 2011 | 365 hp | EcoBoost 3.5 |
| 2012 | 365 hp | EcoBoost 3.5 |
| 2013 | 365 hp | EcoBoost 3.5 |
| 2014 | 365 hp | EcoBoost 3.5 |
| 2015 | 365 hp | EcoBoost 3.5 |
| 2016 | 365 hp | EcoBoost 3.5 |
| 2017 | 365 hp | EcoBoost 3.5 |
| 2018 | 365 hp | EcoBoost 3.5 |
| 2018 | 375 hp | EcoBoost 3.5 |
| 2019 | 365 hp | EcoBoost 3.5 |
| 2019 | 375 hp | EcoBoost 3.5 |
| 2020 | 375 hp | EcoBoost 3.5 |
| 2021 | 375 hp | EcoBoost 3.5 |
| 2022 | 380 hp | EcoBoost 3.5 |
| 2022 | 400 hp | EcoBoost 3.5 |
| 2023 | 380 hp | EcoBoost 3.5 |
| 2023 | 400 hp | EcoBoost 3.5 |
| 2024 | 380 hp | EcoBoost 3.5 |
| 2024 | 400 hp | EcoBoost 3.5 |
| 2025 | 400 hp | EcoBoost 3.5 |
| 2026 | 400 hp | EcoBoost 3.5 |