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GMC Small Block Chevy (1967) specs: 283 ci (4.6L) 8-cylinder, 3.875 x 3.00 in (98.4 x 76.2 mm) bore and stroke. Rated 175 hp, 1967.
The GMC Small Block Chevy (1967) is oversquare — the 3.8748" bore exceeds the 3" stroke by 29.2% — a layout that favors airflow and RPM over leverage at the crank. The 3" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. A rod ratio of 1.9 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 35.4 ci (580 cc).
It is one of 27 engines in the Small Block Chevy family, sitting between the 265 ci and 400 ci members.
| Displacement | 283 ci / 4.6 L |
|---|---|
| Bore | 3.8748" |
| Stroke | 3" |
| Cylinders | 8 |
| Configuration | V8 |
| Rod length | 5.7" |
| Rod ratio | 1.9 |
| Bore/stroke ratio | 1.292 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-8-4-3-6-5-7-2 |
| Advertised HP | 175 hp |
| Years | 1967 |
| Bore/stroke character | 1.292 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,000 ft/min — conservative for a street engine |
| Rod ratio | 1.9 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 35.4 ci |
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1 factory vehicle, 1967. Each year opens that model's engine table.