See other engines in this family
Pontiac 213ci specs: 213 ci (3.5L) 6-cylinder, 3.898 x 2.992 in (99 x 76 mm) bore and stroke, 9.6:1 compression. Rated 200-201 hp, 2005–2006. OHV.
The Pontiac 213ci is oversquare — the 3.898" bore exceeds the 2.992" stroke by 30.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.992" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. A rod ratio of 2.012 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).
9.6:1 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.
2 factory variants share these dimensions, rated from 200 to 201 hp across 2005–2006.
| Displacement | 213 ci / 3.5 L |
|---|---|
| Bore | 3.898" |
| Stroke | 2.992" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 9.6:1 |
| Rod length | 6.02" |
| Rod ratio | 2.012 |
| Bore/stroke ratio | 1.303 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 200–201 hp |
| Years | 2005–2006 |
| Bore/stroke character | 1.303 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Rod ratio | 2.012 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 35.5 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2005 | 200 hp | — |
| 2006 | 201 hp | — |