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Dodge 1956 270 189HP specs: 270 ci (4.4L) 8-cylinder, 3.625 x 3.25 in (92.1 x 82.6 mm) bore and stroke, 8:1 compression. Rated 189 hp, 1956.
The Dodge 1956 270 189HP is oversquare — the 3.625" bore exceeds the 3.25" stroke by 11.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.25" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 33.8 ci (553 cc).
8:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Dodge 270ci family, all of them 270 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 270 ci / 4.4 L |
|---|---|
| Bore | 3.625" |
| Stroke | 3.25" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8:1 |
| Bore/stroke ratio | 1.115 |
| Valvetrain | OHV |
|---|---|
| Induction | 2-bbl |
| Fuel type | gas |
| Advertised HP | 189 hp |
| Years | 1956 |
| Bore/stroke character | 1.115 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,250 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.8 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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