Reference Details
- Common issue
- Later Nailheads and replacement components fit readily; the VIN does not identify 401 versus 425.
- Confidence
- documented
- Correct value
- 401 code T or 425 code W, with number, casting, date, induction, and records agreeing
- Where to check
- Engine stamping, casting numbers and dates, carburetor, air cleaner, and original paperwork
