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Plymouth EGB specs: 167 ci (2.7L) 6-cylinder, 3.386 x 3.091 in (86 x 78.5 mm) bore and stroke, 9.7:1 compression. Rated 200 hp. Rod ratio and piston speed.
The Plymouth Chrysler LH (EGB) is oversquare — the 3.3858" bore exceeds the 3.0906" stroke by 9.6% — a layout that favors airflow and RPM over leverage at the crank. The 3.0906" stroke does not reach 4,000 ft/min of mean piston speed until about 7,750 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 27.8 ci (456 cc).
9.7:1 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 LH family, all of them 167 ci — the differences between them are in compression, heads and rating, not displacement. Factory fitments include the Plymouth Prowler.
| Displacement | 167 ci / 2.7 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.0906" |
| Cylinders | 6 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 1.096 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 200 hp |
| Bore/stroke character | 1.096 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,091 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.8 ci |
| Static compression | 9.7:1 — in the range that usually runs on pump premium |
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