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GMC LV7 specs: 98 ci (1.6L) 4-cylinder, 3.11 x 3.209 in (79 x 81.5 mm) bore and stroke, 10.5:1 compression. Rated 132 hp. DOHC. Rod ratio and piston speed.
The GMC GM Small Gasoline Engine (SGE) (LV7) is close to square: 3.1102" bore against 3.2087" stroke, within 3.1%, which splits the difference between a high-revving layout and a torque layout. The 3.2087" stroke does not reach 4,000 ft/min of mean piston speed until about 7,500 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.5 ci (401 cc).
10.5:1 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 Small Gasoline Engine (SGE) family, the smallest at 98 ci. Factory fitments include the GMC Terrain.
| Displacement | 98 ci / 1.6 L |
|---|---|
| Bore | 3.1102" |
| Stroke | 3.2087" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.969 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 132 hp |
| Bore/stroke character | 0.969 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,209 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.5 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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