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Plymouth EGJ specs: 214 ci (3.5L) 6-cylinder, 3.78 x 3.189 in (96 x 81 mm) bore and stroke, 10:1 compression. Rated 214 hp. SOHC. Rod ratio and piston speed.
The Plymouth Chrysler EGJ (EGJ) is oversquare — the 3.7795" bore exceeds the 3.189" stroke by 18.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.189" stroke does not reach 4,000 ft/min of mean piston speed until about 7,550 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 35.7 ci (584 cc).
10:1 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 3 engines in the Chrysler EGJ family, all of them 214 ci — the differences between them are in compression, heads and rating, not displacement. Factory fitments include the Plymouth Prowler.
| Displacement | 214 ci / 3.5 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.189" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.185 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 214 hp |
| Bore/stroke character | 1.185 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,189 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.7 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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