Reference Details
- Common issue
- A date-plausible 401 block or correct-looking engine tag treated as conclusive proof of the factory-installed original engine without car-specific paperwork.
- Confidence
- documented
- Correct value
- 401 block displacement casting and valve-cover tag or casting-date evidence identify engine family and build timing, but AMC V-8s do not provide a car-specific engine number that directly proves original installation in one vehicle.
- Where to check
- Block displacement castings near the engine-mount area, valve-cover engine tag, casting numbers and dates, build sheet, window sticker, original service or ownership records