Firewall date vs Number on frame

[Neil Mylar LakewoodCA]

For those of you that have dates on your firewall, does the date appear to be before or after the date of the motor on your title?

I imagine it could go either way, but I'd like to see if there is a pattern.

Gas tanks were dated when they were tested.

Motors were stamped when they were initially tested and there is a chart that shows what date it was stamped.

I'm curious how those dates match up.

In other words, lets say the motor number on your title was stamped on June 1, 1929. Is the date on your firewall before or after that date?