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Chevrolet LX9 specs: 213 ci (3.5L) 6-cylinder, 3.701 x 3.307 in (94 x 84 mm) bore and stroke, 9.8:1 compression. Rated 200 hp, 2004.
The Chevrolet 213ci (LX9) is oversquare — the 3.7008" bore exceeds the 3.3071" stroke by 11.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.3071" stroke does not reach 4,000 ft/min of mean piston speed until about 7,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. A rod ratio of 1.82 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 6 cylinders displaces 35.5 ci (582 cc).
9.8:1 on iron heads is in the range that usually runs on pump premium; iron holds heat, so treat it as the less forgiving side of that range.
It is one of 6 engines in the Chevrolet 213ci family, all of them 213 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 213 ci / 3.5 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.3071" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 9.8:1 * |
| Rod length | 6.02" |
| Rod ratio | 1.82 |
| Bore/stroke ratio | 1.119 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 200 hp |
| Years | 2004 |
| Bore/stroke character | 1.119 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,307 ft/min — conservative for a street engine |
| Rod ratio | 1.82 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 35.5 ci |
| Static compression | 9.8:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 2004. Each year opens that model's engine table.