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Cadillac 425 V8 specs: 425 ci (7.0L) 8-cylinder, 4.083 x 4.059 in (103.7 x 103.1 mm) bore and stroke, 8.2:1 compression. Rated 180 hp. OHV.
The Cadillac 425 V8 is close to square: 4.0827" bore against 4.0591" stroke, within 0.6%, which splits the difference between a high-revving layout and a torque layout. The 4.0591" stroke puts mean piston speed at 4,000 ft/min around 5,900 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 53.1 ci (871 cc).
8.2:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
Factory fitments include the DeVille, Fleetwood Brougham.
| Displacement | 425 ci / 7 L |
|---|---|
| Bore | 4.0827" |
| Stroke | 4.0591" |
| Cylinders | 8 |
| Compression ratio | 8.2:1 |
| Bore/stroke ratio | 1.006 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 180 hp |
| Bore/stroke character | 1.006 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,059 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 53.1 ci |
| Static compression | 8.2:1 — low by modern standards, generally happy on regular pump fuel |
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