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

I asked the "king", and he said early production carbs[usually 1st 2 months of production did not receive the two letter suffix. He also said no 96X 97X 98X 99x 4557s have the GG suffix[90x was about the cutoff on 4557s to receive the GG code]] ,also that it crossed over to other carbs as well...I asked him about the dec 69 without a GG code and he said hes never seen one that late w no GG stamp...Email him direct if you need any more info..Kid

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

Perhaps a Corvette carb without the GG? This site says the 4557 would have been used in some '70 and '71 Corvette 454's as well. Colvin's gives a different # altogether for the '70 and '71 Corvette.

www.thecarburetorshop.com/Kchevrolet4.htm

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

If the 4557 carbs weren't produced after march/70..then what about the 4492 (LS6/L78 auto trans)..the latest date that I have seen is 3rd week jan/70..by the way it has the GR code after the part no. Just thought I would throw this in the discussion.

wilma

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

I probably decoded the date wrong. It is 984.

Can someone tell me what the date is? How do you decode holley date codes?

Picture attached.

http://i33.photobucket.com/albums/d8...70L78/Carb.jpg

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

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

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

Eric,

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

Nils

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

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

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

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.

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

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

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

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.