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Chevrolet 229ci specs: 229 ci (3.8L) 6-cylinder, 3.736 x 3.484 in (94.9 x 88.5 mm) bore and stroke, 9.79:1 compression. Rated 115 hp, 1980.
The Chevrolet 229ci is oversquare — the 3.736" bore exceeds the 3.484" stroke by 7.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.484" 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 1.636 is in the range most production engines fall in. Each of the 6 cylinders displaces 38.2 ci (625 cc).
9.79:1 is in the range that usually runs on pump premium.
It is one of 2 engines in the Chevrolet 229ci family, all of them 229 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 229 ci / 3.8 L |
|---|---|
| Bore | 3.736" |
| Stroke | 3.484" |
| Cylinders | 6 |
| Compression ratio | 9.79:1 |
| Rod length | 5.7" |
| Rod ratio | 1.636 |
| Bore/stroke ratio | 1.072 |
| Piston deck clearance | 0.002" |
| Induction | 1-2 |
|---|---|
| Advertised HP | 115 hp |
| Years | 1980 |
| Bore/stroke character | 1.072 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,484 ft/min — conservative for a street engine |
| Rod ratio | 1.636 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 38.2 ci |
| Static compression | 9.79:1 — in the range that usually runs on pump premium |
| Intake valve diameter | 1.845" |
|---|---|
| Exhaust valve diameter | 1.505" |
| Chamber volume | 55 cc |
| Rocker ratio | 1.5:1 |
| Lifter type | hydraulic |
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