Bore, stroke, displacement and compression for all 2 Chevrolet 302ci engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 302 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.000–4.002" |
| Stroke | 3.000–3.005" |
| Compression | 11.0–12.5:1 |
| Advertised power | 290–360 hp |
| Years | 1967–2023 |
| Cylinder head data | 2 of 2 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Chevrolet 302ci · 4.000" × 3.000" · 12.5:1 | 302 ci | 4" × 3" | 12.5:1 | 350–360 |
| Chevrolet 302ci · 4.002" × 3.005" · 11:1 | 302 ci | 4.002" × 3.005" | 11:1 | 290 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 11:1 to 12.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
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.