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Plymouth LA 360 4-bbl specs: 360 ci (5.9L) 8-cylinder, 4.00 x 3.579 in (101.6 x 90.9 mm) bore and stroke. Rated 175-195 hp, 1978–1979.
The Plymouth LA 360 4-bbl 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. A rod ratio of 1.711 is in the range most production engines fall in. Each of the 8 cylinders displaces 45.0 ci (737 cc).
It is one of 17 engines in the LA family, the largest at 360 ci. 2 factory variants share these dimensions, rated from 175 to 195 hp across 1978–1979.
| Displacement | 360 ci / 5.9 L |
|---|---|
| Bore | 4" |
| Stroke | 3.5787" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8–8.4:1 (published figures vary) |
| Rod length | 6.123" |
| Rod ratio | 1.711 |
| Bore/stroke ratio | 1.118 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-8-4-3-6-5-7-2 |
| Advertised HP | 175–195 hp |
| Years | 1978–1979 |
| 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 |
| Rod ratio | 1.711 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 45.0 ci |
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 |
|---|---|---|
| 1978 | 175 hp | LA 360 4-bbl |
| 1979 | 195 hp | LA 360 4-bbl |
6 factory vehicles, 1975–1980. Each year opens that model's engine table.