Reference Details
- Common issue
- Calling every 1969 L78 chambered exhaust configuration factory-correct without build-date context.
- Confidence
- documented
- Correct value
- Chambered dual exhaust was initially standard on L34 and L78, made optional in November 1968, and discontinued in May 1969
- Where to check
- Build date, exhaust evidence, restoration paperwork, and source date notes
