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Pontiac LG7 specs: 204 ci (3.4L) 6-cylinder, 3.70 x 3.16 in (94 x 80.3 mm) bore and stroke, 9:1 compression. Rated 160 hp, 1992–1993.
The Pontiac 204ci (LG7) is oversquare — the 3.7" bore exceeds the 3.16" stroke by 17.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.16" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 34.0 ci (557 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
2 factory variants share these dimensions, rated at 160 hp across 1992–1993.
| Displacement | 204 ci / 3.4 L |
|---|---|
| Bore | 3.7" |
| Stroke | 3.16" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.171 |
| Fuel type | gas |
|---|---|
| Advertised HP | 160 hp |
| Years | 1992–1993 |
| Bore/stroke character | 1.171 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,160 ft/min — conservative for a street engine |
| Displacement per cylinder | 34.0 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1992 | 160 hp | LG7 |
| 1993 | 160 hp | LG7 |
4 factory vehicles, 1989–1993. Each year opens that model's engine table.