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Plymouth LA (1974–1979) specs: 360 ci (5.9L) 8-cylinder, 4.00 x 3.579 in (101.6 x 90.9 mm) bore and stroke. Rated 170-245 hp, 1974–1979.
The Plymouth LA (1974–1979) is oversquare — the 4" bore exceeds the 3.5787" stroke by 11.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.5787" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 45.0 ci (737 cc).
It is one of 12 engines in the LA family, the largest at 360 ci. 10 factory variants share these dimensions, rated from 170 to 245 hp across 1974–1979.
| Displacement | 360 ci / 5.9 L |
|---|---|
| Bore | 4" |
| Stroke | 3.5787" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.118 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 170–245 hp |
| Years | 1974–1979 |
| Bore/stroke character | 1.118 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,579 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 45.0 ci |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1974 | 180 hp | — |
| 1974 | 245 hp | — |
| 1975 | — | — |
| 1975 | 190 hp | — |
| 1975 | 230 hp | — |
| 1976 | 170 hp | — |
| 1976 | 220 hp | — |
| 1977 | — | — |
| 1978 | 175 hp | — |
| 1979 | 195 hp | — |