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Cadillac L49 specs: 350 ci (5.7L) 8-cylinder, 4.057 x 3.385 in (103 x 86 mm) bore and stroke, 8:1 compression. Built 1980. Used in the Cadillac Seville.
The Cadillac 350ci (L49) is oversquare — the 4.057" bore exceeds the 3.385" stroke by 19.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.385" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 43.8 ci (717 cc).
8:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the Cadillac 350ci family, all of them 350 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 350 ci / 5.7 L |
|---|---|
| Bore | 4.057" |
| Stroke | 3.385" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8:1 * |
| Bore/stroke ratio | 1.199 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 1980 |
| Bore/stroke character | 1.199 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,385 ft/min — conservative for a street engine |
| Displacement per cylinder | 43.8 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1980. Each year opens that model's engine table.