Firebird Engines
| Code & Trans. Type | Disp. & Carb. | Comp. Ratio |
|---|---|---|
| ZC, ZK Synchro-mesh | 250" 6 1 Bbl. | 9.0:1 |
| ZF, ZN Auto. | 250" 6 1 Bbl. | 9.0:1 |
| ZH, ZD Synchro-mesh | 250" 6 4 Bbl. | 10.5:1 |
| ZL, ZE Auto. | 250" 6 4 Bbl. | 10.5:1 |
| WM, WC Synchro-mesh | 350" V8 2 Bbl. | 9.2:1 |
| XB, XL Auto. | 350" V8 2 Bbl. | 9.2:1 |
| YE, YJ Auto. | 350" V8 2 Bbl. | 9.2:1 |
| WN Synchro-mesh | 350" V8 4 Bbl. | 10.5:1 |
| XC Auto. | 350" V8 4 Bbl. | 10.5:1 |
| WZ Synchro-mesh | 400" V8 4 Bbl. | 10.75:1 |
| YT Auto. | 400" V8 4 bbl. | 10.75:1 |
| WQ Synchro-mesh | 400" V8 4 Bbl. | 10.75:1 |
| YW Auto. | 400" V8 4 Bbl. | 10.75:1 |
| WH Synchro-mesh | 400" V8 4 Bbl. | 10.75:1 |
| XN Auto. | 400" V8 4 Bbl. | 10.75:1 |