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The same engine also has a main page: Chevrolet LR1.
GMC LR1 specs: 119 ci (1.9L) 4-cylinder, 3.425 x 3.228 in (87 x 82 mm) bore and stroke, 8.4:1 compression. Rated 82 hp, 1982–1985.
The GMC 119ci (LR1) is oversquare — the 3.4252" bore exceeds the 3.2283" stroke by 6.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.2283" stroke does not reach 4,000 ft/min of mean piston speed until about 7,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 29.8 ci (488 cc).
8.4:1 is low by modern standards and generally happy on regular pump fuel.
4 factory variants share these dimensions, rated at 82 hp across 1982–1985.
| Displacement | 119 ci / 1.9 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.2283" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.4:1 |
| Bore/stroke ratio | 1.061 |
| Fuel type | gas |
|---|---|
| Advertised HP | 82 hp |
| Years | 1982–1985 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. | Duration int / exh | Valve lift int / exh | LSA |
|---|---|---|---|---|---|---|---|
| 1983 | LR1 net | 82 @ 4600 | 101 lb-ft @ 3000 | 8.4:1 | 266° / 255° | — | 109.75° |
| 1984 | LR1 net | 82 @ 4600 | 101 lb-ft @ 3000 | 8.4:1 | 266° / 255° | — | 109.8° |
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 | 1.061 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,228 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.8 ci |
| Static compression | 8.4:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1982 | 82 hp | LR1 |
| 1983 | 82 hp | LR1 |
| 1984 | 82 hp | LR1 |
| 1985 | 82 hp | LR1 |
3 factory vehicles, 1982–1985. Each year opens that model's engine table.