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Chevrolet 632ci (2023) · 575 hp specs: 632 ci (10.4L) 8-cylinder, 4.60 x 4.75 in (116.8 x 120.7 mm) bore and stroke, 12:1 compression. Rated 575 hp, 2023.
The Chevrolet 632ci (2023) · 575 hp is close to square: 4.6" bore against 4.75" stroke, within 3.2%, which splits the difference between a high-revving layout and a torque layout. With a 4.75" stroke, mean piston speed reaches 4,000 ft/min at only 5,050 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. A rod ratio of 1.402 is short — higher piston acceleration and more side-load, typical of stroker combinations and a reason to watch piston speed closely. Each of the 8 cylinders displaces 79.0 ci (1,295 cc).
12:1 on iron heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
| Displacement | 632 ci / 10.4 L |
|---|---|
| Bore | 4.6" |
| Stroke | 4.75" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 12:1 |
| Rod length | 6.66" |
| Rod ratio | 1.402 |
| Bore/stroke ratio | 0.968 |
| Piston deck clearance | 0" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 575 hp |
| Years | 2023 |
| Bore/stroke character | 0.968 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,750 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
| Rod ratio | 1.402 — short — more side loading and piston dwell at TDC, typical of stroker combinations |
| Displacement per cylinder | 79.0 ci |
| Static compression | 12:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.45" |
|---|---|
| Exhaust valve diameter | 1.8" |
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