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Chevrolet 350ci (1989) · 240 hp specs: 350 ci (5.7L) 8-cylinder, 4.001 x 3.484 in (101.6 x 88.5 mm) bore and stroke, 11.53:1 compression. Rated 240 hp, 1989.
The Chevrolet 350ci (1989) · 240 hp is oversquare — the 4.001" bore exceeds the 3.484" stroke by 14.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.484" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.636 is in the range most production engines fall in. Each of the 8 cylinders displaces 43.8 ci (717 cc).
11.53:1 on iron heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 34 engines in the Chevrolet 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 | 4.001" |
| Stroke | 3.484" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 11.53:1 |
| Rod length | 5.7" |
| Rod ratio | 1.636 |
| Bore/stroke ratio | 1.148 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 240 hp |
| Years | 1989 |
| Bore/stroke character | 1.148 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,484 ft/min — conservative for a street engine |
| Rod ratio | 1.636 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 43.8 ci |
| Static compression | 11.53:1 — high enough that pump premium or better is normally required |
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