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Chevrolet 350ci (2013) · 350 hp specs: 350 ci (5.7L) 8-cylinder, 4.125 x 3.27 in (104.8 x 83.1 mm) bore and stroke, 11.8:1 compression. Rated 350 hp, 2013.
The Chevrolet 350ci (2013) · 350 hp is oversquare — the 4.125" bore exceeds the 3.27" stroke by 26.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.27" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. A rod ratio of 1.942 is long by production standards — less side-load on the cylinder wall and gentler piston acceleration around TDC, the geometry that tolerates high RPM. Each of the 8 cylinders displaces 43.8 ci (717 cc).
11.8:1 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 | 4.125" |
| Stroke | 3.27" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 11.8:1 |
| Rod length | 6.35" |
| Rod ratio | 1.942 |
| Bore/stroke ratio | 1.261 |
| Piston deck clearance | 0.01" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 350 hp |
| Years | 2013 |
| Bore/stroke character | 1.261 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,270 ft/min — conservative for a street engine |
| Rod ratio | 1.942 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 43.8 ci |
| Static compression | 11.8:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.165" |
|---|---|
| Exhaust valve diameter | 1.59" |
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