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Buick GM High Feature V6 specs: 217 ci (3.6L) 6-cylinder, 3.701 x 3.37 in (94 x 85.6 mm) bore and stroke, 11.3:1 compression. Rated 280-288 hp. DOHC.
The Buick GM High Feature V6 is oversquare — the 3.7008" bore exceeds the 3.3701" stroke by 9.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.3701" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 36.2 ci (593 cc).
11.3:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 8 engines in the GM High Feature V6 family, the smallest at 217 ci. 2 factory variants share these dimensions, rated from 280 to 288 hp. Factory fitments include the Buick Enclave, Buick LaCrosse, Enclave and 2 others.
| Displacement | 217 ci / 3.6 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.3701" |
| Cylinders | 6 |
| Compression ratio | 11.3:1 |
| Bore/stroke ratio | 1.098 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 280–288 hp |
| Bore/stroke character | 1.098 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,370 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.2 ci |
| Static compression | 11.3:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| — | 280 hp | LF1 |
| — | 288 hp | LLT |