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Chrysler RB 413 specs: 413 ci (6.8L) 8-cylinder, 4.188 x 3.75 in (106.4 x 95.3 mm) bore and stroke, 10.1:1 compression. Rated 340-350 hp, 1959–1965.
The Chrysler RB 413 is oversquare — the 4.1875" bore exceeds the 3.75" stroke by 11.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.75" stroke puts mean piston speed at 4,000 ft/min around 6,400 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).
10.1:1 on iron heads is in the range that usually runs on pump premium; iron holds heat, so treat it as the less forgiving side of that range.
It is one of 2 engines in the Chrysler 413ci family, all of them 413 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated from 340 to 350 hp across 1959–1965.
| Displacement | 413 ci / 6.8 L |
|---|---|
| Bore | 4.1875" |
| Stroke | 3.75" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.1:1 |
| Bore/stroke ratio | 1.117 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-8-4-3-6-5-7-2 |
| Advertised HP | 340–350 hp |
| Years | 1959–1965 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1959 | gross | 350 | — | 10.1:1 |
| 1960 | gross | 350 @ 4600 | 470 lb-ft @ 2800 | 10.1:1 |
| 1961 | gross | 350 | — | 10.1:1 |
| 1963 | gross | 340 @ 4600 | — | 10.1:1 |
| 1964 | gross | 340 | 470 lb-ft | 10.1:1 |
| 1965 | gross | 340 | — | 10.1:1 |
Factory specification sheet.
| Bore/stroke character | 1.117 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,750 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 51.6 ci |
| Static compression | 10.1:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1959 | 350 hp | RB 413 |
| 1960 | 350 hp | RB 413 |
| 1961 | 350 hp | RB 413 |
| 1963 | 340 hp | RB 413 |
| 1964 | 340 hp | RB 413 |
| 1965 | 340 hp | RB 413 |
3 factory vehicles, 1959–1965. Each year opens that model's engine table.