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Chevrolet LS3 specs: 376 ci (6.2L) 8-cylinder, 4.065 x 3.622 in (103.3 x 92 mm) bore and stroke. Rated 426-430 hp, 2008–2015. Used in the Chevrolet Corvette.
The Chevrolet LS (LS3) is oversquare — the 4.065" bore exceeds the 3.622" stroke by 12.2% — 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 47.0 ci (770 cc).
It is one of 57 engines in the LS family, sitting between the 293 ci and 454 ci members. 12 factory variants share these dimensions, rated from 426 to 430 hp across 2008–2015.
| Displacement | 376 ci / 6.2 L |
|---|---|
| Bore | 4.065" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.122 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 426–430 hp |
| Years | 2008–2015 |
| Bore/stroke character | 1.122 — 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 | 47.0 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 |
|---|---|---|
| 2008 | 430 hp | LS3 |
| 2009 | 430 hp | LS3 |
| 2010 | 426 hp | LS3 |
| 2010 | 430 hp | LS3 |
| 2011 | 426 hp | LS3 |
| 2011 | 430 hp | LS3 |
| 2012 | 426 hp | LS3 |
| 2012 | 430 hp | LS3 |
| 2013 | 426 hp | LS3 |
| 2013 | 430 hp | LS3 |
| 2014 | 426 hp | LS3 |
| 2015 | 426 hp | LS3 |