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Buick 364ci specs: 364 ci (6.0L) 8-cylinder, 4.125 x 3.40 in (104.8 x 86.4 mm) bore and stroke, 8.5:1 compression. Rated 210 hp, 1960.
The Buick 364ci is oversquare — the 4.125" bore exceeds the 3.4" stroke by 21.3% — 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. A rod ratio of 1.794 is long by production standards — less side-load on the cylinder wall and gentler piston acceleration around TDC, the geometry that tolerates high RPM. Each of the 8 cylinders displaces 45.5 ci (746 cc).
8.5:1 is low by modern standards and generally happy on regular pump fuel.
| Displacement | 364 ci / 6 L |
|---|---|
| Bore | 4.125" |
| Stroke | 3.4" |
| Cylinders | 8 |
| Compression ratio | 8.5:1 |
| Rod length | 6.1" |
| Rod ratio | 1.794 |
| Bore/stroke ratio | 1.213 |
| Piston deck clearance | 0.028" |
| Induction | 1-2 |
|---|---|
| Advertised HP | 210 hp |
| Years | 1960 |
| Bore/stroke character | 1.213 — 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 |
| Rod ratio | 1.794 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 45.5 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
| Intake valve diameter | 1.875" |
|---|---|
| Exhaust valve diameter | 1.5" |
| Chamber volume | 123.72 cc |
| Rocker ratio | 1.6:1 |
| Lifter type | hydraulic |
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