Reference Details
- Common issue
- 1974 SD-455 W8/Y8 or regular 455 block codes represented as 1973 SD-455 codes
- Confidence
- documented
- Correct value
- ZJ for 1973 SD-455 manual; XD for 1973 SD-455 automatic
- Where to check
- Engine code stamped into the right-front of the block, just below the cylinder head
