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The same engine also has a main page: Chevrolet LQ7.
GMC LQ7 specs: 137 ci (2.2L) 4-cylinder, 3.465 x 3.622 in (88 x 92 mm) bore and stroke, 21:1 compression. Rated 62 hp, 1984–1985.
The GMC 137ci (LQ7) is close to square: 3.4646" 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 4 cylinders displaces 34.3 ci (561 cc).
At 21:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
2 factory variants share these dimensions, rated at 62 hp across 1984–1985.
| Displacement | 137 ci / 2.2 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.622" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 21:1 |
| Bore/stroke ratio | 0.957 |
| Fuel type | diesel |
|---|---|
| Advertised HP | 62 hp |
| Years | 1984–1985 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. | Duration int / exh | Valve lift int / exh | LSA |
|---|---|---|---|---|---|---|---|
| 1984 | LQ7 net | 62 @ 4300 | 96 lb-ft @ 2200 | 21:1 | 250° | — | 110° |
Factory specification sheet. Durations are the factory's advertised figures at the basis printed on the sheet, not duration at .050" lift; lobe separation is calculated from the printed valve timing.
| Bore/stroke character | 0.957 — 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 | 34.3 ci |
| Static compression | 21:1 — 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 |
|---|---|---|
| 1984 | 62 hp | LQ7 |
| 1985 | 62 hp | LQ7 |
2 factory vehicles, 1984–1985. Each year opens that model's engine table.