Reference Details
- Common issue
- A regular 421 HO car, later engine swap, or tribute may be described as a Super Duty.
- Confidence
- documented
- Correct value
- Factory-billed 1963 Super Duty 421 built before Pontiac ended the program early in the model year
- Where to check
- PHS billing history, factory invoice, build date, dealer or team allocation, and period provenance