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Chevrolet LSX454 specs: 454 ci (7.4L) 8-cylinder, 4.185 x 4.125 in (106.3 x 104.8 mm) bore and stroke, 11:1 compression. Rated 620 hp. OHV.
The Chevrolet LSX454 is close to square: 4.185" bore against 4.125" stroke, within 1.5%, which splits the difference between a high-revving layout and a torque layout. The 4.125" stroke puts mean piston speed at 4,000 ft/min around 5,800 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 56.8 ci (930 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 57 engines in the LS family, the largest at 454 ci.
| Displacement | 454 ci / 7.4 L |
|---|---|
| Bore | 4.185" |
| Stroke | 4.125" |
| Cylinders | 8 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.015 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 620 hp |
| Bore/stroke character | 1.015 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,125 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 56.8 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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