See other engines in this family
Chevrolet 262ci (1975) · 110 hp specs: 262 ci (4.3L) 8-cylinder, 3.671 x 3.10 in (93.2 x 78.7 mm) bore and stroke, 9.561:1 compression. Rated 110 hp, 1975.
The Chevrolet 262ci (1975) · 110 hp is oversquare — the 3.671" bore exceeds the 3.1" stroke by 18.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.1" stroke does not reach 4,000 ft/min of mean piston speed until about 7,750 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. A rod ratio of 1.839 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 32.8 ci (537 cc).
9.561:1 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 7 engines in the Chevrolet 262ci family, all of them 262 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 262 ci / 4.3 L |
|---|---|
| Bore | 3.671" |
| Stroke | 3.1" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.561:1 |
| Rod length | 5.7" |
| Rod ratio | 1.839 |
| Bore/stroke ratio | 1.184 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 110 hp |
| Years | 1975 |
| Bore/stroke character | 1.184 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,100 ft/min — conservative for a street engine |
| Rod ratio | 1.839 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 32.8 ci |
| Static compression | 9.561:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.