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Plymouth High Performance Package specs: 413 ci (6.8L) 8-cylinder, 4.126 x 3.902 in (104.8 x 99.1 mm) bore and stroke. Rated 360 hp, 1964. OHV.
The Plymouth High Performance Package is oversquare — the 4.126" bore exceeds the 3.9016" stroke by 5.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.9016" stroke puts mean piston speed at 4,000 ft/min around 6,150 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 51.6 ci (846 cc).
It is one of 25 engines in the RB family, the smallest at 413 ci.
| Displacement | 413 ci / 6.8 L |
|---|---|
| Bore | 4.126" |
| Stroke | 3.9016" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.058 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 360 hp |
| Years | 1964 |
| Bore/stroke character | 1.058 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,902 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 51.6 ci |
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