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Plymouth 1958 350 295HP specs: 350 ci (5.7L) 8-cylinder, 4.063 x 3.375 in (103.2 x 85.7 mm) bore and stroke, 10:1 compression. Rated 295 hp, 1958.
The Plymouth 1958 350 295HP is oversquare — the 4.0625" bore exceeds the 3.375" stroke by 20.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.375" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 43.8 ci (717 cc).
10:1 is in the range that usually runs on pump premium.
It is one of 27 engines in the B family, the smallest at 350 ci.
| Displacement | 350 ci / 5.7 L |
|---|---|
| Bore | 4.0625" |
| Stroke | 3.375" |
| Cylinders | 8 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.204 |
| Valvetrain | OHV |
|---|---|
| Induction | 4-bbl |
| Fuel type | gas |
| Advertised HP | 295 hp |
| Years | 1958 |
| Bore/stroke character | 1.204 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,375 ft/min — conservative for a street engine |
| Displacement per cylinder | 43.8 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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