Bore, stroke, displacement and compression for all 10 GMC Chevy Straight-6 (194/230/250/292) engines, compared side by side. Free spec reference.
| Displacement | 194–292 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.563–3.875" |
| Stroke | 3.250–4.125" |
| Compression | 8.0–8.5:1 |
| Advertised power | 100–170 hp |
| Years | 1963–1980 |
| Cylinder head data | 2 of 10 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 292 | 292 ci | 3.875" × 4.125" | 8:1 | 170 |
| Chevy Straight-6 (194/230/250/292) (1963–1971) | 292 ci | 3.875" × 4.125" | — | 165–170 |
| L25 | 292 ci | 3.875" × 4.125" | — | 165–170 |
| 250 | 250 ci | 3.875" × 3.53" | 8.5:1 | 155 |
| L22 | 250 ci | 3.875" × 3.53" | — | 110–155 |
| LD4 | 250 ci | 3.875" × 3.53" | — | 100–105 |
| LE3 | 250 ci | 3.875" × 3.53" | — | 130 |
| 230 | 230 ci | 3.875" × 3.25" | 8.5:1 | 140 |
| Chevy Straight-6 (194/230/250/292) (1963–1965) | 230 ci | 3.875" × 3.25" | — | 140 |
| 194 | 194 ci | 3.5625" × 3.25" | 8.5:1 | 120 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
The family mixes oversquare and undersquare designs, so members behave quite differently despite sharing a name.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.