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Cadillac 500 specs: 500 ci (8.2L) 8-cylinder, 4.30 x 4.304 in (109.2 x 109.3 mm) bore and stroke, 8.5:1 compression. Rated 400 hp. Rod ratio and piston speed.
The Cadillac OHV V8 (500) is close to square: 4.3" bore against 4.304" stroke, within 0.1%, which splits the difference between a high-revving layout and a torque layout. The 4.304" stroke puts mean piston speed at 4,000 ft/min around 5,600 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 62.5 ci (1,024 cc).
8.5:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the Cadillac OHV V8 family, the largest at 500 ci. Factory fitments include the Cadillac Eldorado, Cadillac DeVille, Cadillac Fleetwood and 2 others.
| Displacement | 500 ci / 8.2 L |
|---|---|
| Bore | 4.3" |
| Stroke | 4.304" |
| Cylinders | 8 |
| Compression ratio | 8.5:1 |
| Bore/stroke ratio | 0.999 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 400 hp |
| Bore/stroke character | 0.999 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,304 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 62.5 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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