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Jeep Vigilante V-8 4-bbl specs: 327 ci (5.4L) 8-cylinder, 4.00 x 3.252 in (101.6 x 82.6 mm) bore and stroke. Rated 270 hp, 1966–1968.
The Jeep Vigilante V-8 4-bbl is oversquare — the 4" bore exceeds the 3.252" stroke by 23.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.252" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 40.9 ci (670 cc).
It is one of 3 engines in the Vigilante family, all of them 327 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 270 hp across 1966–1968.
| Displacement | 327 ci / 5.4 L |
|---|---|
| Bore | 4" |
| Stroke | 3.252" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.23 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 270 hp |
| Years | 1966–1968 |
| Bore/stroke character | 1.230 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,252 ft/min — conservative for a street engine |
| Displacement per cylinder | 40.9 ci |
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 |
|---|---|---|
| 1966 | 270 hp | Vigilante V-8 4-bbl |
| 1967 | 270 hp | Vigilante V-8 4-bbl |
| 1968 | 270 hp | Vigilante V-8 4-bbl |