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Ford 5.8L Trinity specs: 355 ci (5.8L) 8-cylinder, 3.681 x 4.165 in (93.5 x 105.8 mm) bore and stroke, 9:1 compression. Rated 662 hp, 2013–2014.
The Ford 5.8L Trinity is undersquare — the 4.165" stroke exceeds the 3.681" bore by 11.6% — a layout that trades peak RPM for leverage and torque low in the range. The 4.165" stroke puts mean piston speed at 4,000 ft/min around 5,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 44.4 ci (727 cc).
Static compression of 9:1 on aluminum heads is low for the displacement, which is deliberate on a boosted engine — the supercharger supplies the rest of the effective ratio, and static compression plus boost together set the fuel requirement.
2 factory variants share these dimensions, rated at 662 hp across 2013–2014.
| Displacement | 355 ci / 5.8 L |
|---|---|
| Bore | 3.681" |
| Stroke | 4.165" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.884 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Valves per cylinder | 4 |
| Induction | supercharged |
| Advertised HP | 662 hp |
| Years | 2013–2014 |
| Bore/stroke character | 0.884 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,165 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 44.4 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2013 | 662 hp | — |
| 2014 | 662 hp | — |