Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login


Take the time to read our Privacy Policy.

DINK36 Offline
#1 Posted : Monday, 19 June 2023 10:24:54 PM(UTC)
DINK36

Rank: Member

Reputation:

Groups: Registered
Joined: 25/12/2006(UTC)
Posts: 18
Location: In the shed

Thanks: 2 times
Looking for a HT350 29283 ZC quadrajet, possible trade for a HQ 350 manual carb.
HK1837 Offline
#2 Posted : Tuesday, 20 June 2023 6:03:38 PM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,582

Thanks: 1 times
Was thanked: 481 time(s) in 459 post(s)
Which one? There are 5 x distinct HT 350M carbs. Unless you get the right one for your car you might as well fit the HQ carby.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
DINK36 Offline
#3 Posted : Wednesday, 21 June 2023 8:26:14 AM(UTC)
DINK36

Rank: Member

Reputation:

Groups: Registered
Joined: 25/12/2006(UTC)
Posts: 18
Location: In the shed

Thanks: 2 times
The HQ 350 4speed carb i have is NOS, it would be a shame to use it on anything other than the correct car. Other than date codes i didnt realize there was a difference
HK1837 Offline
#4 Posted : Wednesday, 21 June 2023 11:23:18 AM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,582

Thanks: 1 times
Was thanked: 481 time(s) in 459 post(s)
My point was all of the HK through to HQ carbs (until ADR27 compliant engines appeared about 8/73) are the same, only difference being the vacuum source between auto and manual applications.

As a bit of background, we got a US numbered carb supplied to us for GTS327 as it was a 1967 spec carb which was pre-emissions. 1968 spec carbs in the USA went to pollution spec so GMH got their own unique numbers starting around the introduction of the Canadian 327 engine. 702 was 1960's, with 703 being the Californian spec pollution carb up until 1967, then all 702 became pollution spec. When the 1970 model year started the carbs went to 704.

So whilst a late HK through to HG were 7029281, 2, 3 and 4 for respectively 308 manual, 308 auto, 350 manual and 350 auto, the HQ initially were 7041281, 2, 3 and 4. Identical carbs, the 4 instead of 2 meaning 1970's and the 1 instead of the 9 as they were first numbered in 1971 instead of 1969. Back to the point, the only difference between the 350 manual carbs for HQ and HT is the numbers. If you are chasing Concours correctness, the wrong HT carb is no better than a HQ carb as the only difference is the numbers. Of the 5 x different HT carbs, they are all stamped either differently or missing codes or different date codes. So a carby off a late HT GTS350M is wrong in a Concours sense for all of the HT's prior to it and vice versa, and you'll pay in excess of $10k for one as well, so you are best getting the right one, or use a far cheaper wrong one, like use a US 7029213 which you'll pickup for near nothing. Also be careful, someone was stamping blank carb bodies a few years back and you don't want to go paying big bucks for a fake.

Further background, at any given time the same spec/tune carb was used for everything from 240hp 327 to 300hp 350. So the 250hp L73 (GTS327 engine) used the same carb as the 275hp L30 (fuelie headed 327) to the 295/300hp 350 (L48 aka HT-HG GTS350 manual). They just got slightly different numbers depending upon the brand usage (8 in for example 7029283 for GMH in the 60's and earlier 70's), the 702/703/704 variation and the 4th digit for the year of introduction of the carb. There is also some variations in the final digit over and above manual V auto, to do with variations along the way.

Edited by user Wednesday, 21 June 2023 11:29:16 AM(UTC)  | Reason: Not specified

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
 2 users thanked HK1837 for this useful post.
Smitty2 on 21/06/2023(UTC), DINK36 on 21/06/2023(UTC)
DINK36 Offline
#5 Posted : Wednesday, 21 June 2023 1:56:48 PM(UTC)
DINK36

Rank: Member

Reputation:

Groups: Registered
Joined: 25/12/2006(UTC)
Posts: 18
Location: In the shed

Thanks: 2 times
Some great info there, thankyou. My car is an original paint driver, far from concourse. I would however like an original correct carb so i guess you just gave me 10000 reasons to go to ever swapmeet i can :). What in your opinion do you think my 71 HQ 350 4 speed NOS carb is worth realistically ?

Edited by user Wednesday, 21 June 2023 2:03:27 PM(UTC)  | Reason: Not specified

HK1837 Offline
#6 Posted : Wednesday, 21 June 2023 3:16:07 PM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,582

Thanks: 1 times
Was thanked: 481 time(s) in 459 post(s)
$10-$15k. Just need the right buyer.

Finding a HT-HG GTS350 carby will be your challenge.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
DINK36 Offline
#7 Posted : Wednesday, 21 June 2023 5:38:37 PM(UTC)
DINK36

Rank: Member

Reputation:

Groups: Registered
Joined: 25/12/2006(UTC)
Posts: 18
Location: In the shed

Thanks: 2 times
I'll find one, stay tuned :)
HK1837 Offline
#8 Posted : Wednesday, 21 June 2023 5:44:32 PM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,582

Thanks: 1 times
Was thanked: 481 time(s) in 459 post(s)
It’s a waste getting the wrong one though. Like putting a Dandenong engine in a Pagewood car.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
 1 user thanked HK1837 for this useful post.
Smitty2 on 21/06/2023(UTC)
Smitty2 Offline
#9 Posted : Wednesday, 21 June 2023 7:28:41 PM(UTC)
Smitty2

Rank: Member

Reputation:

Groups: Registered
Joined: 6/07/2019(UTC)
Posts: 351
Australia
Location: bayside Melbourne

Thanks: 218 times
Was thanked: 26 time(s) in 26 post(s)
Originally Posted by: HK1837 Go to Quoted Post
It’s a waste getting the wrong one though. Like putting a Dandenong engine in a Pagewood car.


haha.. possible in the day, not now though Shame on you
Club circuit racing...the best fun you can have with your pants on
DINK36 Offline
#10 Posted : Friday, 29 December 2023 3:36:46 PM(UTC)
DINK36

Rank: Member

Reputation:

Groups: Registered
Joined: 25/12/2006(UTC)
Posts: 18
Location: In the shed

Thanks: 2 times
I have since found a HT350 auto carb but it has a 73 date code so im guessing its a service replacement carb. Any thoughts
HK1837 Offline
#11 Posted : Friday, 29 December 2023 5:44:53 PM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,582

Thanks: 1 times
Was thanked: 481 time(s) in 459 post(s)
Never heard or seen one, I'd be suspect of it. There are a fair few fakes around. GMH would have just sold you a HQ 350 auto carby as a replacement no need for a HT one.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
justgm Offline
#12 Posted : Wednesday, 3 January 2024 6:24:25 AM(UTC)
justgm

Rank: Member

Reputation:

Groups: Registered
Joined: 30/04/2005(UTC)
Posts: 462
Man
New Zealand

Was thanked: 14 time(s) in 13 post(s)
I would still check the jetting on the carb you end up with. Correct jetting for HT 350 M is main metering rods 45B , main jets 71 and secondary metering rods AN. Thanks Mark.
life is good in "Wine & Holden Marlborough "
 2 users thanked justgm for this useful post.
Smitty2 on 3/01/2024(UTC), DINK36 on 7/01/2024(UTC)
DINK36 Offline
#13 Posted : Sunday, 7 January 2024 9:41:37 AM(UTC)
DINK36

Rank: Member

Reputation:

Groups: Registered
Joined: 25/12/2006(UTC)
Posts: 18
Location: In the shed

Thanks: 2 times
Originally Posted by: justgm Go to Quoted Post
I would still check the jetting on the carb you end up with. Correct jetting for HT 350 M is main metering rods 45B , main jets 71 and secondary metering rods AN. Thanks Mark.


If somebody was going to the effort to restamp a rare carb why would they stamp a 73 date code when it should be 69. Doesnt make sense to me
HK1837 Offline
#14 Posted : Sunday, 7 January 2024 11:39:33 AM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,582

Thanks: 1 times
Was thanked: 481 time(s) in 459 post(s)
I seriously doubt its a service carby. GMH got heaps of the engines and carbs prior to the end of HG to send over in the CKD packs for South African SS so any spares were most likely procured then. It is also possible it's a boat carby. GMH were supplying complete 350 engines in the early 70's to Ski Craft, these were later engines but used the HK-HG engine numbers, it is possible the carby is off one of those. From memory all of the boat 308 engines supplied into the later 70's also had auto late HQ / early HJ carbs on them.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
Users browsing this topic
Guest (3)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF | YAF © 2003-2024, Yet Another Forum.NET
This page was generated in 0.053 seconds.