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Pontiac L32 specs: 350 ci (5.7L) 8-cylinder, 3.80 x 3.85 in (96.5 x 97.8 mm) bore and stroke, 8:1 compression. Built 1975. Used in the Pontiac Ventura. OHV.
The Pontiac 350ci (L32) 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).
8:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 20 engines in the Pontiac 350ci family, all of them 350 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 350 ci / 5.7 L |
|---|---|
| Bore | 3.8" |
| Stroke | 3.85" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8:1 * |
| Bore/stroke ratio | 0.987 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-8-4-3-6-5-7-2 |
| Years | 1975 |
| 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 |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 1975. Each year opens that model's engine table.