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Cadillac LC3 specs: 266.7 ci (4.4L) 8-cylinder, 3.583 x 3.307 in (91 x 84 mm) bore and stroke, 9:1 compression. Rated 440 hp. Rod ratio and piston speed.
The Cadillac Northstar (LC3) is oversquare — the 3.5827" bore exceeds the 3.3071" stroke by 8.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.3071" stroke does not reach 4,000 ft/min of mean piston speed until about 7,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 33.3 ci (546 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the Northstar family, the smallest at 266.7 ci. Factory fitments include the Cadillac XLR-V, Cadillac STS-V.
| Displacement | 266.7 ci / 4.4 L |
|---|---|
| Bore | 3.5827" |
| Stroke | 3.3071" |
| Cylinders | 8 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.083 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 440 hp |
| Bore/stroke character | 1.083 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,307 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.3 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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