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Chevrolet LS7 specs: 427 ci (7.0L) 8-cylinder, 4.125 x 4.00 in (104.8 x 101.6 mm) bore and stroke. Rated 505 hp, 2007–2015. Used in the Chevrolet Corvette.
The Chevrolet LS (LS7) is close to square: 4.125" bore against 4" stroke, within 3.1%, which splits the difference between a high-revving layout and a torque layout. The 4" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 53.4 ci (875 cc).
It is one of 57 engines in the LS family, sitting between the 293 ci and 454 ci members. 9 factory variants share these dimensions, rated at 505 hp across 2007–2015.
| Displacement | 427 ci / 7 L |
|---|---|
| Bore | 4.125" |
| Stroke | 4" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.031 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 505 hp |
| Years | 2007–2015 |
| Bore/stroke character | 1.031 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 53.4 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 |
|---|---|---|
| 2007 | 505 hp | LS7 |
| 2008 | 505 hp | LS7 |
| 2009 | 505 hp | LS7 |
| 2010 | 505 hp | LS7 |
| 2011 | 505 hp | LS7 |
| 2012 | 505 hp | LS7 |
| 2013 | 505 hp | LS7 |
| 2014 | 505 hp | LS7 |
| 2015 | 505 hp | LS7 |