Holley Chevy Carb ID Help

[RALLY]

I am looking at Holley Chevy Carb to buy. Here are the numbers stamped on the Air Horn, can you tell me what these mean. Is this a service carb? Factory Carb? Guy claims this Carb was used on the 71-72 Camaro Z-28 LT-1 Engines. Factory or Service Carb? Any help is greatly appreciated.
#3999263
List 6239-1
3460

[John Brown]

346th day of a year ending in zero? 80, 90, 00.....

[RALLY]

346th day of a year ending in zero? 80, 90, 00.....

Thanks, how can i tell if this is a service carb or factory install? He claims this carb is off a 71- 72 Camaro Z-28 LT-1? Any way of telling that? Sorry dont know much about carb ID's.

[SS427]

It is either a later GM service carb based on the dating or it could be a Holley re-release restoration carb as I do not know what dates they used on their restoration carbs. Regardless, I would say this is not an original 71-72 carb.

[RALLY]

It is either a later GM service carb based on the dating or it could be a Holley re-release restoration carb as I do not know what dates they used on their restoration carbs. Regardless, I would say this is not an original 71-72 carb.
Thanks Rick. Appreciate your info.

[John Brown]

Thanks, how can i tell if this is a service carb or factory install? He claims this carb is off a 71- 72 Camaro Z-28 LT-1? Any way of telling that? Sorry dont know much about carb ID's.

Definitely not a factory installed carb. Aftermarket or over the counter from GM, but not an assembly line carb.

[RALLY]

Definitely not a factory installed carb. Aftermarket or over the counter from GM, but not an assembly line carb.

Thanks John, great info and thank you.