1969 L78 muffler date

[daveg]

You are correct and there are only 31 days in January.

Not going to call it a proven fact but it is looking like

Prefix on the 69- later examples is a shift or whatever designation.

The next stuff is the date.

Suffix "A" is for the manufacturer "Arvin".

This is a work in progress.

Originally Posted by Dusk Blue Z

I thought there were only 28 or 29 days in February.

[daveg]

The pair in post 7 are small block also.