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Pontiac LC4 specs: 252 ci (4.1L) 6-cylinder, 3.965 x 3.40 in (100.7 x 86.4 mm) bore and stroke, 8:1 compression. Built 1982. Used in the Buick Electra.
The Pontiac 252ci (LC4) is oversquare — the 3.965" bore exceeds the 3.4" stroke by 16.6% — a layout that favors airflow and RPM over leverage at the crank. The 3.4" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 42.0 ci (688 cc).
8:1 is low by modern standards and generally happy on regular pump fuel.
| Displacement | 252 ci / 4.1 L |
|---|---|
| Bore | 3.965" |
| Stroke | 3.4" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 8:1 |
| Bore/stroke ratio | 1.166 |
| Fuel type | gas |
|---|---|
| Years | 1982 |
| Bore/stroke character | 1.166 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,400 ft/min — conservative for a street engine |
| Displacement per cylinder | 42.0 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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11 factory vehicles, 1980–1984. Each year opens that model's engine table.