1969 L78 muffler date

[daveg]

Another pair of Arvins
Pics 1- 3 were taken off a 1970.
Pic 4 is the Yenko from 2002 thread here.
Pic 5 is from her car.

Looks to me the replacement pair [note part number] off the 70 may be dated 123rd day of 1974.
Dates match just like hers.

If that is the case the 31st day of 1969 is a perfect fit on her car.
Many- Many parts on her car with Jan 1969 dates.

Would have thought this had been looked into with some sellers really bragging up "factory exhaust" on cars.

We simply want to know the real story on muffler dates.