See other engines in this family
Pontiac LV2 specs: 307 ci (5.0L) 8-cylinder, 3.80 x 3.385 in (96.5 x 86 mm) bore and stroke. Built 1981. Used in the Oldsmobile 88 and Oldsmobile 98. OHV.
The Pontiac 307ci (LV2) is oversquare — the 3.8" bore exceeds the 3.385" stroke by 12.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.385" 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 8 cylinders displaces 38.4 ci (629 cc).
It is one of 3 engines in the Pontiac 307ci family, all of them 307 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 307 ci / 5 L |
|---|---|
| Bore | 3.8" |
| Stroke | 3.385" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8–8.5:1 (published figures vary) |
| Bore/stroke ratio | 1.123 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Years | 1981 |
| Bore/stroke character | 1.123 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,385 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.4 ci |
Each link opens the calculator with this engine's specs already filled in.
11 factory vehicles, 1980–1990. Each year opens that model's engine table.