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Plymouth 33 V6 specs: 201 ci (3.3L) 6-cylinder, 3.661 x 3.189 in (93 x 81 mm) bore and stroke, 8.9:1 compression. Rated 150 hp. Rod ratio and piston speed.
The Plymouth 33 V6 is oversquare — the 3.6614" bore exceeds the 3.189" stroke by 14.8% — 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 33.5 ci (549 cc).
8.9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
Factory fitments include the Voyager, Grand Voyager, Plymouth Grand Voyager and 1 other.
| Displacement | 201 ci / 3.3 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.189" |
| Cylinders | 6 |
| Compression ratio | 8.9:1 |
| Bore/stroke ratio | 1.148 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 150 hp |
| Bore/stroke character | 1.148 — 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 | 33.5 ci |
| Static compression | 8.9:1 — low by modern standards, generally happy on regular pump fuel |
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