Reference Details
- Common issue
- Earlier rectangular-port 390 or later AMC V8 parts represented as the original 1970 Gen 3 390 assembly without matching dates and paperwork
- Confidence
- reported
- Correct value
- A 1970 Gen 3 390 engine should be checked for 390 block-size casting evidence and 3196291 dog-leg cylinder-head casting evidence, then reconciled with VIN, engine tag, dates, and build records
- Where to check
- Block casting area between freeze plugs behind the mounting plates, cylinder-head casting numbers, engine tag, VIN, build sheet, window sticker