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Plymouth Chrysler EGA/EGB (1950–1959) specs: 230 ci (3.8L) 6-cylinder, 3.78 x 3.425 in (96 x 87 mm) bore and stroke. Rated 103-138 hp, 1950–1959.
The Plymouth Chrysler EGA/EGB (1950–1959) is oversquare — the 3.7795" bore exceeds the 3.4252" stroke by 10.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4252" stroke puts mean piston speed at 4,000 ft/min around 7,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 38.3 ci (628 cc).
It is one of 3 engines in the Chrysler EGA/EGB family, the largest at 230 ci. 6 factory variants share these dimensions, rated from 103 to 138 hp across 1950–1959.
| Displacement | 230 ci / 3.8 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.4252" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 1.103 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 103–138 hp |
| Years | 1950–1959 |
| Bore/stroke character | 1.103 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,425 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.3 ci |
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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 |
|---|---|---|
| 1950 | 103 hp | — |
| 1955 | 123 hp | — |
| 1956 | 131 hp | — |
| 1957 | 138 hp | — |
| 1958 | 138 hp | — |
| 1959 | 135 hp | — |