The Oldsmobile decoding section contains information about:
- General Engine specs – bore/stroke, firing order
- Engine codes
- Engine colors
- Cutlass Production Numbers
Firing Order: (1967 and up Oldsmobile): Counter-clockwise 1-8-4-3-6-5-7-2
| CID | Year | Bore x Stroke |
| 307 | 80 – 90 | 3.800 X 3.385 |
| 330 | 64 – 67 | 3.938 X 3.385 |
| 350 | 68 – 80 | 4.057 X 3.385 |
| 400 | 65 – 67 | 4.000 X 3.980 |
| 400 | 68 – 69 | 3.870 X 4.250 |
| 403 | 77 – 79 | 4.351 X 3.385 |
| 425 | 65 – 67 | 4.126 X 3.975 |
| 455 | 68 – 76 | 4.126 X 4.250 |
