Reference Details
- Common issue
- Standard 428, 390, 410, or other FE block represented as a factory 428 Cobra Jet block.
- Confidence
- reported
- Correct value
- A typical Cobra Jet FE block has a sand-cast C on the rear of the block; an A rear mark indicates a standard 428 passenger-car block and no mark points away from a 428 CJ block in the cited detailing reference.
- Where to check
- Rear of the engine block; normally requires engine-out or difficult installed-engine inspection.