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Buick 300 specs: 300 ci (4.9L) 8-cylinder, 3.75 x 3.40 in (95.3 x 86.4 mm) bore and stroke, 9:1 compression. Rated 210 hp. OHV. Rod ratio and piston speed.
The Buick Small-Block V8 (300) is oversquare — the 3.75" bore exceeds the 3.4" stroke by 10.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 37.5 ci (615 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 8 engines in the Buick Small-Block V8 family, the smallest at 300 ci. Factory fitments include the Buick Skylark, Buick Special, Buick LeSabre and 2 others.
| Displacement | 300 ci / 4.9 L |
|---|---|
| Bore | 3.75" |
| Stroke | 3.4" |
| Cylinders | 8 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.103 |
| Piston deck clearance | 0.036" |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 210 hp |
| Bore/stroke character | 1.103 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,400 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.5 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
| Intake valve diameter | 1.625" |
|---|---|
| Exhaust valve diameter | 1.313" |
| Chamber volume | 50.14 cc |
| Rocker ratio | 1.6:1 |
| Lifter type | hydraulic |
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