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Chevrolet LS specs: 376 ci (6.2L) 8-cylinder, 4.065 x 3.622 in (103.3 x 92 mm) bore and stroke, 9.1:1 compression. Rated 556-638 hp. OHV.
The Chevrolet LS 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).
9.1:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 57 engines in the LS family, sitting between the 293 ci and 454 ci members. 2 factory variants share these dimensions, rated from 556 to 638 hp. Factory fitments include the Chevrolet Corvette C6 ZR1, Cadillac CTS-V (Gen 2), Chevrolet Camaro ZL1 (Gen 5) and 1 other.
| Displacement | 376 ci / 6.2 L |
|---|---|
| Bore | 4.065" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Compression ratio | 9.1:1 |
| Bore/stroke ratio | 1.122 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 556–638 hp |
| 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 |
| Static compression | 9.1:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| — | 556 hp | LSA |
| — | 638 hp | LS9 |