Reference Details
- Common issue
- A replacement or restamped block represented as original without a factory-format 426 identification number at the documented boss location and supporting paperwork.
- Confidence
- documented
- Correct value
- Factory engine identification uses a two-letter plant code, three-digit cubic-inch displacement, four-digit date code, and four-digit daily sequence; the 426 entry is listed, with the identification boss located at the left side, front of block, below the cylinder head.
- Where to check
- Engine identification-number boss on the block, then reconcile the stamped format and date/sequence with factory paperwork for the specific car.