Holley Carb Ink Stamp decode

[ronzz572]

I also have used information from the motor to restore my 70 z28 motor. My motor after it came from the hot tank had the very same paint marks. Steve Maybe Eric Jackson will see this post and give us a answer.

[John Brown]

I wanna see the date on the AC spark plug box. If it's not 1970 dated, it's not real.

[BCreekDave]

Originally Posted by John Brown

I wanna see the date on the AC spark plug box. If it's not 1970 dated, it's not real.

Could be a case where there isn't a box? If its an assembly line only item, how would there be a box? Maybe they "walked" out the door back then?
But I agree, I would need some kind of origination evidence or something before spending that kind of money.

Back to the original topic and again sorry for the hijack, but Steve did you come to any conclusions about the ink stamps?

[L16pilot]

Hi Dave - Nope...not as far as deciphering the codes. My plan is to duplicate the data/fonts on rubber stamps based on the myopic info available....then be prepared to change/correct it if new info becomes available.

[BCreekDave]

Originally Posted by L16pilot

Hi Dave - Nope...not as far as deciphering the codes. My plan is to duplicate the data/fonts on rubber stamps based on the myopic info available....then be prepared to change/correct it if new info becomes available.

Thanks for the update.

Those are on I bet just about every GM Holley from that era. I wonder if the NCRS-Corvette guys know? Maybe not what they are supposed to be on each car, but at least what they mean.

[L16pilot]

"Pictures of similar plugs at http://www.1970z28camaro.com/engine/ along with pictures of carb stamps."

Yup, very well known site and that car remains a benchmark for Van Nuys built 70 Zs. But, it is a TH400 car, so the carb is different than the 4555 4-speed Holley along with the stamps.

"I wonder if the NCRS-Corvette guys know?"

I still need to check with a friend that has some very good connections in the NCRS...thanks for the reminder

[John Brown]

Originally Posted by BCreekDave

Could be a case where there isn't a box? If its an assembly line only item, how would there be a box? Maybe they "walked" out the door back then?
But I agree, I would need some kind of origination evidence or something before spending that kind of money.

Back to the original topic and again sorry for the hijack, but Steve did you come to any conclusions about the ink stamps?

Pictures of similar plugs at http://www.1970z28camaro.com/engine/ along with pictures of carb stamps.

[Flying Undertaker]

I believe the ink stamp codes on the bowls are for either the bowl or bowl/float assembly codes for manufacturing use on assembly. I have seen the same codes for different year carb bowls, so it would rule out a DATE code. The same goes for the vacuum diaphragm, spring, and housing assembly. Just my opinion. Don.

[L16pilot]

Don - I tend to agree...just wish there was some document trail or evidence verify.

BTW, I spoke to my friend who has restored some nice mid-year Vettes and has been involved with the NCRS for years...basically, no clue, so maybe the ink stamp process was something implemented by Holley after '67??..maybe beginning '70? Not a lot of data points out there, so it's just speculation at this point.