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Chevrolet L83 specs: 325 ci (5.3L) 8-cylinder, 3.78 x 3.622 in (96 x 92 mm) bore and stroke, 11:1 compression. Rated 355 hp. OHV. Rod ratio and piston speed.
The Chevrolet Gen V LT (L83) is close to square: 3.7795" bore against 3.622" stroke, within 4.3%, which splits the difference between a high-revving layout and a torque layout. 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 40.6 ci (666 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 14 engines in the Gen V LT family, the smallest at 325 ci. Factory fitments include the Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe and 2 others.
| Displacement | 325 ci / 5.3 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.043 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 355 hp |
| Bore/stroke character | 1.043 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.6 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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