72 LT-1 Holley list number

[Lindsay H.]

Trying to confirm I have the original 780. GM# 3999263 GA accords with the judging manual. Date code is Aug 71 which may or may not be a bit early for my engine assembly date in Feb/72. The real issue is the Holley list number of 6239. Judging manual says there may be a letter or number or both that follow but nothing on mine. All of the other reference material I have seen refers to either 6239A or 6239-1A as the list number. Someone from Holley says that they never stamped the A on the list number. Has anyone come across the issue before?Many thanks.

[Terry M.]

Re: 72 LT-1 Holley list number

Trying to confirm I have the original 780. GM# 3999263 GA accords with the judging manual. Date code is Aug 71 which may or may not be a bit early for my engine assembly date in Feb/72. The real issue is the Holley list number of 6239. Judging manual says there may be a letter or number or both that follow but nothing on mine. All of the other reference material I have seen refers to either 6239A or 6239-1A as the list number. Someone from Holley says that they never stamped the A on the list number. Has anyone come across the issue before?Many thanks.

I will have a long day today before I get home, but I will try to check the LT1 data before I leave town at O'Dark Thirty tomorrow.

[Lindsay H.]

Re: 72 LT-1 Holley list number

great thanks

72 warbonnet yellow
08 Z06 jetstream as well

[Roy V.]

Re: 72 LT-1 Holley list number

My late build (July 13th, 1972) holley has;
the 3999263-GA stamped on it (I believe this is the GM number)
the 6239-1 (Holley list number)
the 244 (date code - 4th week of April, 1972)

Regards
Roy

[Lindsay H.]

Re: 72 LT-1 Holley list number

thanks Roy. the first number is the GM number . The key is your Holley list number which has the-1 after it. thx for the info.

[Terry M.]

Re: 72 LT-1 Holley list number

Lindsay,
I found the List 6239 mostly in the beginning of production (Say the first three months of production), then a couple of 6239A then a whole bunch (like a dozen) of 6239-1. One 6239 right at the end of production. Now all that said it is possible that some of those with no suffix were simply reported by people who didn't understand the importance (or didn't attach any importance) to the suffix -- and so it simply was not reported. Also there is no effort to determine originality on the list. We simply record what we are sent.

I do remember Dave Strickland has/had a very late build 1972 LT1 and we found if memory serves a 6239-1A. It had different numbered metering block(s) than what the books called for. Dave would have a better memory of those details than I do.

[Lindsay H.]

Re: 72 LT-1 Holley list number

Thanks Terry.That info is consistent with the Aug 71 date on the carb even though it wasnt used until my assembly date. What that tells me is that while one cant definitively determine whether its the original carb, at least 6239 was used on some of the cars, which is very helpful in the context of the my car. I had an email from Holley over the weekend which stated that the 6239 and 6239A are one and the same carb used on 72 LT-1s. Thanks once again for your help.

Lindsay

[Terry M.]

Re: 72 LT-1 Holley list number

I am glad it all falls into place.

BTW: As I thought more about this post while driving through the corn fields of Illinois this weekend I realized it was not Dave Strictland who had the late 1972 with the 1A suffix. It was Dick Ackenbach.

[Dave S.]

Re: 72 LT-1 Holley list number

I am glad it all falls into place.

BTW: As I thought more about this post while driving through the corn fields of Illinois this weekend I realized it was not Dave Strictland who had the late 1972 with the 1A suffix. It was Dick Ackenbach.

Terry,
Its nice to be thought of but you are right. It is Dick. You were on the right track though. I have a May 1971 LT-1 with an August 1970 date on it but it had the correct list number. We determined back in 2004 that the carb was correct and it confirmed that Holley made some carbs in large batches.

[Terry M.]

Re: 72 LT-1 Holley list number

Terry,
Its nice to be thought of but you are right. It is Dick. You were on the right track though. I have a May 1971 LT-1 with an August 1970 date on it but it had the correct list number. We determined back in 2004 that the carb was correct and it confirmed that Holley made some carbs in large batches.

[Lindsay H.]

Re: 72 LT-1 Holley list number

ok and thanks again for your help-it was very useful.

LH

[John H.]

Re: 72 LT-1 Holley list number

.. and a Bimmer, some word like Dianna on the trunk

Terry -

That word was "Dinan" - very well-known BMW Tuner outfit that specializes in turbo conversions and big-buck displacement increases. They haul.

[Terry M.]

Re: 72 LT-1 Holley list number

Terry -

That word was "Dinan" - very well-known BMW Tuner outfit that specializes in turbo conversions and big-buck displacement increases. They haul.

That is it John. Not well known to me, but I don't travel in them circles. He and the SUVs were hauling. I was happy to have a "rabbit" in front of me.

[Erich M.]

Re: 72 LT-1 Holley list number

Lindsay,

I am the original owner of my 1972 LT1. Build Date Nov 30, 1971.
Engine build date: Aug 13 1971
Carb Date: 2nd week Sept 1971 (code 192)

Carb LIST # is 6239. It has no suffix.

Erich Meyer
5 Star Bowtie

[Lindsay H.]

Re: 72 LT-1 Holley list number

That's another favorable confirmation for me. Much appreciated Erich

Lindsay