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Buick Buick 350 (VIN H/J/X) specs: 350 ci (5.7L) 8-cylinder, 3.80 x 3.85 in (96.5 x 97.8 mm) bore and stroke. Built 1977–1980. Used in the Buick Electra.
The Buick Buick 350 (VIN H/J/X) is close to square: 3.8" bore against 3.85" stroke, within 1.3%, which splits the difference between a high-revving layout and a torque layout. The 3.85" stroke puts mean piston speed at 4,000 ft/min around 6,250 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 43.8 ci (717 cc).
It is one of 11 engines in the Buick 350ci family, all of them 350 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions across 1977–1980.
| Displacement | 350 ci / 5.7 L |
|---|---|
| Bore | 3.8" |
| Stroke | 3.85" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8–8.5:1 (published figures vary) |
| Bore/stroke ratio | 0.987 |
How to tell which you have: The 5th character of the VIN is the engine code: H (2-bbl) or J (4-bbl) for 1976-77 and X for 1978-80 is the Buick-built 350. A Buick 350 has the distributor at the front and the oil-fill cap on the timing cover.
| Fuel type | gas |
|---|---|
| Firing order | 1-8-4-3-6-5-7-2 |
| Years | 1977–1980 |
| Bore/stroke character | 0.987 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,850 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.8 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 |
|---|---|---|
| 1977 | — | Buick 350 (VIN H/J/X) |
| 1978 | — | Buick 350 (VIN H/J/X) |
| 1979 | — | Buick 350 (VIN H/J/X) |
| 1980 | — | Buick 350 (VIN H/J/X) |
3 factory vehicles, 1977–1980. Each year opens that model's engine table.