Reference Details
- Common issue
- Standard 390/428 FE block represented as Cobra Jet; date code too late or inconsistent with car build.
- Confidence
- reported
- Correct value
- C-scratch reinforced-web block marker typical of Cobra Jet blocks, with date code near oil-filter adapter checked against car build date
- Where to check
- Rear of engine block and lower block date-code area near oil-filter adapter