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Chevrolet 427ci (2006) · 505 hp specs: 427 ci (7.0L) 8-cylinder, 4.125 x 4.00 in (104.8 x 101.6 mm) bore and stroke, 11:1 compression. Rated 505 hp, 2006.
The Chevrolet 427ci (2006) · 505 hp is close to square: 4.125" bore against 4" stroke, within 3.1%, which splits the difference between a high-revving layout and a torque layout. The 4" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.517 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 53.4 ci (875 cc).
11:1 on iron heads is high enough that pump premium or better is normally required, and iron holds heat, so it is the less forgiving side of that line.
It is one of 7 engines in the Chevrolet 427ci family, all of them 427 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 427 ci / 7 L |
|---|---|
| Bore | 4.125" |
| Stroke | 4" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 11:1 |
| Rod length | 6.067" |
| Rod ratio | 1.517 |
| Bore/stroke ratio | 1.031 |
| Piston deck clearance | 0.052" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 505 hp |
| Years | 2006 |
| Bore/stroke character | 1.031 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.517 — short — more side loading and piston dwell at TDC, typical of stroker combinations |
| Displacement per cylinder | 53.4 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.205" |
|---|---|
| Exhaust valve diameter | 1.615" |
| Chamber volume | 68 cc |
| Rocker ratio | 1.5:1 |
| Lifter type | hydraulic |
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