Bore, stroke, displacement and compression for all 3 Mazda K-Series engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 137.6–152.4 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.327" |
| Stroke | 2.638–2.921" |
| Compression | 8.0–10.0:1 |
| Advertised power | 164–210 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| KL-ZE | 152.4 ci | 3.3268" × 2.9213" | 10:1 | 164–200 |
| KL DE V6 | 152.4 ci | 3.3268" × 2.9213" | 9.2:1 | 164 |
| KL-DE (Miller Cycle) | 137.6 ci | 3.3268" × 2.6378" | 8:1 | 210 |
Every engine here shares a 3.3268" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
Compression spans 8:1 to 10:1, 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.