Firing order: 1-6-5-4-3-2 (165432).
Cylinder numbering: 1-3-5 one bank, 2-4-6 the other
| Engines | Buick 90-degree V6 family: 198/225 Fireball/Dauntless, 231, 252, 3800 Series I/II/III incl. supercharged, 3.3 |
| Years | 1962-2008 |
| Firing order | 1-6-5-4-3-2 |
| Cylinder numbering | 1-3-5 one bank, 2-4-6 the other |