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Cadillac LP1 specs: 170 ci (2.8L) 6-cylinder, 3.504 x 2.945 in (89 x 74.8 mm) bore and stroke, 10:1 compression. Rated 210 hp, 2005–2007.
The Cadillac 170ci (LP1) is oversquare — the 3.5039" bore exceeds the 2.9449" stroke by 19.0% — a layout that favors airflow and RPM over leverage at the crank. The 2.9449" stroke does not reach 4,000 ft/min of mean piston speed until about 8,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 28.3 ci (464 cc).
10:1 is in the range that usually runs on pump premium.
3 factory variants share these dimensions, rated at 210 hp across 2005–2007.
| Displacement | 170 ci / 2.8 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 2.9449" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10:1 * |
| Bore/stroke ratio | 1.19 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 210 hp |
| Years | 2005–2007 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2007 | LP1 net | 210 | — | — |
Factory specification sheet.
| Bore/stroke character | 1.190 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,945 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2005 | 210 hp | LP1 |
| 2006 | 210 hp | LP1 |
| 2007 | 210 hp | LP1 |
1 factory vehicle, 2005–2007. Each year opens that model's engine table.