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Ram EVA (FlexFuel) specs: 287 ci (4.7L) 8-cylinder, 3.661 x 3.413 in (93 x 86.7 mm) bore and stroke, 9.7:1 compression. Rated 310 hp. SOHC.
The Ram EVA (FlexFuel) is oversquare — the 3.6614" bore exceeds the 3.4134" stroke by 7.3% — 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 8 cylinders displaces 35.9 ci (588 cc).
9.7:1 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 8 engines in the PowerTech family, the largest at 287 ci. 2 factory variants share these dimensions, rated at 310 hp. Factory fitments include the Ram 1500.
| Displacement | 287 ci / 4.7 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.4134" |
| Cylinders | 8 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 1.073 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 310 hp |
| Bore/stroke character | 1.073 — 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 | 35.9 ci |
| Static compression | 9.7:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| — | 310 hp | EVA (FlexFuel) |
| — | 310 hp | PowerTech 4.7 HO, EVA (FlexFuel) |