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Chevrolet LS specs: 293 ci (4.8L) 8-cylinder, 3.78 x 3.268 in (96 x 83 mm) bore and stroke, 9.1:1 compression. Rated 295-302 hp. Rod ratio and piston speed.
The Chevrolet LS is oversquare — the 3.7799" bore exceeds the 3.2677" stroke by 15.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.2677" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 36.6 ci (600 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, the smallest at 293 ci. 2 factory variants share these dimensions, rated from 295 to 302 hp. Factory fitments include the Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Express Van and 1 other.
| Displacement | 293 ci / 4.8 L |
|---|---|
| Bore | 3.7799" |
| Stroke | 3.2677" |
| Cylinders | 8 |
| Compression ratio | 9.1:1 |
| Bore/stroke ratio | 1.157 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 295–302 hp |
| Bore/stroke character | 1.157 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,268 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.6 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 |
|---|---|---|
| — | 295 hp | LY2 |
| — | 302 hp | L20 |