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Chevrolet Gen V LT specs: 376 ci (6.2L) 8-cylinder, 4.065 x 3.622 in (103.3 x 92 mm) bore and stroke, 11.5:1 compression. Rated 420-495 hp. OHV.
The Chevrolet Gen V LT 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).
11.5:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 14 engines in the Gen V LT family, sitting between the 325 ci and 400.6 ci members. 5 factory variants share these dimensions, rated from 420 to 495 hp. Factory fitments include the Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe and 8 others.
| Displacement | 376 ci / 6.2 L |
|---|---|
| Bore | 4.065" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Compression ratio | 11.5:1 |
| Bore/stroke ratio | 1.122 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 420–495 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 | 11.5:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| — | 420 hp | L86, L87 |
| — | 455 hp | LT1 |
| — | 460 hp | LT1 (Z51) |
| — | 490 hp | LT2 |
| — | 495 hp | LT2 (Z51) |