The letter I was not used on what part, 1967

[Keith G.]

Can't remembe what part the letter I was not used on for dating. It's hell to get old.

[Joe L.]

Re: The letter I was not used on what part, 1967

Can't remembe what part the letter I was not used on for dating. It's hell to get old.

Keith-----

I don't think there's a hard-and-fast rule for when it was used or not used. Also, there was no one particular part that didn't use an "I" for the date code. For the most part, castings and forgings use an "I" (to denote September). Most parts which use a stamped or printed date code skip the "I". Some examples of parts which skip the "I" are distributors, most carburetors with with alpha-numeric date coding, and starters. I believe some alternators used the "I" in the date coding. Also, body build date codes use the "I".

Some GM divisions got around the "I" confusion---they used julian date coding which is entirely numeric.

[Ronald L.]

Re: The letter I was not used on what part, 1967

Lots of parts jumped over the "I" and for that reason you see M. Check things on a Dec - Jan car and you'll see lots of this.

[Jack H.]

Re: The letter I was not used on what part, 1967

The memory assist rule I use is this:

If the date code is embossed (an insert in the mold), the letter 'I' was used. Those who maintained molds were a higher paid form of labor.

If the date code is stamped, the letter 'I' wasn't used. An "I' and a '1' are visually similar and lesser paid labor was used to load the gang stamps and 'wack' the part...

[John H.]

Re: The letter I was not used on what part, 1967

Pretty universally, GM-produced electrical components (starters, generators, alternators , voltage regulators, horn relays, distributors, etc.) had stamped date codes and skipped over the "I" character. Conversely, GM-produced castings (raised date codes) used the "I" character.

[Paul J.]

Re: The letter I was not used on what part, 1967

Keith, as I recall, there's a list in Noland's book.

Paul