1966 Chevy II
| Code | Displ. & Carb. | Comp. Ratio |
|---|---|---|
| OA, OC, OH | 153" 4 1 Bbl. | 8.5:1 |
| OK, OM, ZY, OR, ZX, OS | 194" 6 1 Bbl. | 8.5:1 |
| PV, PC, PX, PI | 230" 6 1 Bbl. | 8.5:1 |
| PK, PQ, PS, PN, PP, PU, PO PO | 283" V8 2 Bbl. | 9.25:1 |
| QA, QB, QC, QF, PK, PP, QD, QE | 283" V8 4 Bbl. | 9.25:1 |
| ZA, ZE, EB, ZC, ZK, ZM, ZD, ZF | 327" V8 4 Bbl. | 10.5:1 |
| ZI, ZJ, ZG, ZH | 327" V8 4 Bbl. | 11.0:1 |