See other engines in this family
Chevrolet LS1 specs: 346 ci (5.7L) 8-cylinder, 3.90 x 3.622 in (99.1 x 92 mm) bore and stroke. Rated 320-350 hp, 1997–2002. Used in the Chevrolet Corvette.
The Chevrolet LS (LS1) is oversquare — the 3.9" bore exceeds the 3.622" stroke by 7.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 43.3 ci (709 cc).
It is one of 57 engines in the LS family, sitting between the 293 ci and 454 ci members. 8 factory variants share these dimensions, rated from 320 to 350 hp across 1997–2002.
| Displacement | 346 ci / 5.7 L |
|---|---|
| Bore | 3.9" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.077 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 320–350 hp |
| Years | 1997–2002 |
| Bore/stroke character | 1.077 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.3 ci |
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 |
|---|---|---|
| 1997 | 345 hp | LS1 |
| 1998 | 345 hp | LS1 |
| 1999 | 345 hp | LS1 |
| 2000 | 320 hp | LS1 |
| 2001 | 325 hp | LS1 |
| 2001 | 350 hp | LS1 |
| 2002 | 325 hp | LS1 |
| 2002 | 350 hp | LS1 |