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Chevrolet 262ci (1988) · 140 hp specs: 262 ci (4.3L) 6-cylinder, 4.001 x 3.48 in (101.6 x 88.4 mm) bore and stroke, 10.9:1 compression. Rated 140 hp, 1988.
The Chevrolet 262ci (1988) · 140 hp is oversquare — the 4.001" bore exceeds the 3.48" stroke by 15.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.48" 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 1.638 is in the range most production engines fall in. Each of the 6 cylinders displaces 43.7 ci (716 cc).
10.9:1 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 | 4.001" |
| Stroke | 3.48" |
| Cylinders | 6 |
| Compression ratio | 10.9:1 |
| Rod length | 5.7" |
| Rod ratio | 1.638 |
| Bore/stroke ratio | 1.15 |
| Piston deck clearance | 0.016" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 140 hp |
| Years | 1988 |
| Bore/stroke character | 1.150 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,480 ft/min — conservative for a street engine |
| Rod ratio | 1.638 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 43.7 ci |
| Static compression | 10.9:1 — in the range that usually runs on pump premium |
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