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GMC LCV specs: 169 ci (2.8L) 6-cylinder, 3.386 x 3.161 in (86 x 80.3 mm) bore and stroke, 10.2:1 compression. Rated 250 hp. DOHC. Rod ratio and piston speed.
The GMC High Feature V6 (LCV) is oversquare — the 3.3858" bore exceeds the 3.1614" stroke by 7.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.1614" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 28.2 ci (462 cc).
10.2:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 6 engines in the High Feature V6 family, the smallest at 169 ci. Factory fitments include the Cadillac CT6.
| Displacement | 169 ci / 2.8 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.1614" |
| Cylinders | 6 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 1.071 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 250 hp |
| Bore/stroke character | 1.071 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,161 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.2 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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