List 4557 "GG" carb ('70 LS6 M/T)

[VintageMusclecar]

9 = The last digit of the year, in this case 1969
8 = The month of production, in this case, August
4 = The week of the month, in this case, the 4th week.

When decoding the month, remember that 1-9 is for January through September, "0" is October, "A" is November, and "B" is December.

When decoding the year, you have to account for the decade of production as well. A carb with a 3-digit date code is easy to decode, but starting around 1972 they went to a 4 digit Julian date code system which can confuse matters.

The Julian system uses the first 3 digits to denote the day of the year, and the last digit is again the year of prodduction.

Example: 2503
250 = the 250th day of the year
3 = the year of production, which could be 1973, 1983, 1993, etc.

Eric

[nrjulin]

Eric,

Awesome info. Thanks alot. When I'm ready I will send the carb to you for restoration.

Nils

[70-SS/RS-L78]

I thought all 70 SS/L78's had a GG carb...

[nrjulin]

The August date of my carb is too early for my L-78 with an April build date. I will be looking for a better dated carb. for my restoration.

[70-SS/RS-L78]

Nils
My L78 is a June build with a Sept dated GG carb.
They are getting expensive...

[Mr70]

My Oct.69 built L-78 Chevelle has a Sept. dated 4492,without a two letter GR suffix.I believe there was some production confusion on the deletion of the suffix on the early assembled carbs.,be it over the counter or assembly line installed.
You should use the vehicles Cowl tag date for a Carb. reference point,and not precede it.
I've yet to see any 1970 L-78 Chevelle with a suffix on it's carb,regardless of plant,because they were only produced in the first 100 days of production.
The 6 assembly plants building the LS-6 Chevelle have shown suffixes appearing on their Carbs. as early as Dec.69,probably because the LS-6 was produced later.

[nrjulin]

I'm more confused now.


In Musclecarkid's post he said that "no 96X 97X 98X 99x 4557s have the GG suffix[90x was about the cutoff on 4557s to receive the GG code]]"

and Eric explained the date decodeing as 98x is August, 99x is September: then no September of 69 4557 carbs should have the GG which mark says his 4557 carb has.

Did I misunderstand what is being said?

Sorry if this is hijacking the thread.

[nrjulin]

Anyone???

If it is just me being thick headed let me know. I'm fine with that too.