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Ford EcoBoost 3.5 High Output specs: 213.4 ci (3.5L) 6-cylinder, 3.642 x 3.413 in (92.5 x 86.7 mm) bore and stroke. Rated 400-440 hp, 2018–2026.
The Ford EcoBoost 3.5 High Output 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. 9 factory variants share these dimensions, rated from 400 to 440 hp across 2018–2026.
| 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 | 400–440 hp |
| Years | 2018–2026 |
| 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 |
|---|---|---|
| 2018 | 400 hp | EcoBoost 3.5 High Output |
| 2019 | 400 hp | EcoBoost 3.5 High Output |
| 2020 | 400 hp | EcoBoost 3.5 High Output |
| 2021 | 400 hp | EcoBoost 3.5 High Output |
| 2022 | 440 hp | EcoBoost 3.5 High Output |
| 2023 | 440 hp | EcoBoost 3.5 High Output |
| 2024 | 440 hp | EcoBoost 3.5 High Output |
| 2025 | 440 hp | EcoBoost 3.5 High Output |
| 2026 | 440 hp | EcoBoost 3.5 High Output |