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Saturn LZ4 specs: 214 ci (3.5L) 6-cylinder, 3.898 x 2.992 in (99 x 76 mm) bore and stroke, 9.8:1 compression. Rated 219 hp. OHV. Rod ratio and piston speed.
The Saturn GM High Value (LZ4) is oversquare — the 3.8976" bore exceeds the 2.9921" stroke by 30.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.9921" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 35.7 ci (584 cc).
9.8:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 2 engines in the GM High Value family, the largest at 214 ci. Factory fitments include the Saturn Aura XE.
| Displacement | 214 ci / 3.5 L |
|---|---|
| Bore | 3.8976" |
| Stroke | 2.9921" |
| Cylinders | 6 |
| Compression ratio | 9.8:1 |
| Bore/stroke ratio | 1.303 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 219 hp |
| Bore/stroke character | 1.303 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.7 ci |
| Static compression | 9.8:1 — in the range that usually runs on pump premium |
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