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Chrysler 426ci 4.125" bore specs: 426 ci (7.0L) 8-cylinder, 4.125 x 4.00 in (104.8 x 101.6 mm) bore and stroke. Rated 450-460 hp, 2009–2015. OHV.
The Chrysler 426ci 4.125" bore 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 1.5 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 53.3 ci (873 cc).
3 factory variants share these dimensions, rated from 450 to 460 hp across 2009–2015.
| Displacement | 426 ci / 7 L |
|---|---|
| Bore | 4.125" |
| Stroke | 4" |
| Cylinders | 8 |
| Configuration | V8 |
| Rod length | 6" |
| Rod ratio | 1.5 |
| Bore/stroke ratio | 1.031 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 450–460 hp |
| Years | 2009–2015 |
| 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 | 1.5 — short — more side loading and piston dwell at TDC, typical of stroker combinations |
| Displacement per cylinder | 53.3 ci |
| Intake valve diameter | 2.144" |
|---|---|
| Exhaust valve diameter | 1.659" |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2009 | 450 hp | — |
| 2010 | 450 hp | — |
| 2015 | 460 hp | — |