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Chevrolet 236ci (1969) specs: 236 ci 4-cylinder, 3.875 x 5.00 in (98.4 x 127 mm) bore and stroke. Built 1969. Used in the Checker Marathon.
The Chevrolet 236ci (1969) is undersquare — the 5" stroke exceeds the 3.875" bore by 22.5% — a layout that trades peak RPM for leverage and torque low in the range. With a 5" stroke, mean piston speed reaches 4,000 ft/min at only 4,800 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 4 cylinders displaces 59.0 ci (967 cc).
| Displacement | 236 ci |
|---|---|
| Bore | 3.875" |
| Stroke | 5" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.775 |
| Fuel type | diesel |
|---|---|
| Years | 1969 |
| Bore/stroke character | 0.775 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 5,000 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
| Displacement per cylinder | 59.0 ci |
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1 factory vehicle, 1969. Each year opens that model's engine table.