HQ Quadrajet

**mauser** · 11-09-2011, 08:13 PM

Hi,

Pulling the HQ down today I took the numbers off the 4-barrel on the 308. It still has the mechanical linkages.

7043283
3443

I think this is a HQ carby. Saying that I have been told the later ones off the dunnydoors are signifcantly better. How much is the question?

Mauser

**ozbox** · 11-09-2011, 08:28 PM

stick with your early one...

**HQ SS** · 11-09-2011, 08:53 PM

HI mauser.
In this carby's case 3443 means the 343th day of 1973.
So a real late 73 built carby
7043283 I have listed as a 308 Manual HQ late build LH early build carby
Cheers Paul.

**mauser** · 11-09-2011, 09:00 PM

Originally Posted by HQ SS

HI mauser.
In this carby's case 3443 means the 343th day of 1973.
So a real late 73 built carby
7043283 I have listed as a 308 Manual HQ late build LH early build carby
Cheers Paul.

Thanks Paul. The car is 5/74 so I guess it took a while to paddle over on the boat. :-)

I assume you can get kits to rebuild those? The back butterflys arnt working too well. No squrties on the startup either.

Mauser

**HQ SS** · 11-09-2011, 11:04 PM

As far as I know kits are still available and from memory it is the RT-601 carby kit that suits the early carbys.
Cheers Paul.

**HK1837** · 12-09-2011, 07:21 AM

As Paul says it suits later HQ, early LH plus early HJ manual 308.

The blue motor carbs are better for 2 x reasons but no compelling reason to change yours:

1. Primary metering rods are adjustable without pulling the car apart.
2. If you change valley cover to Edelbrock or KC the choke mech is on the carby; early carbs have it on the manifold (divorced choke).

**mauser** · 12-09-2011, 07:46 AM

Originally Posted by HK1837

As Paul says it suits later HQ, early LH plus early HJ manual 308.

The blue motor carbs are better for 2 x reasons but no compelling reason to change yours:

1. Primary metering rods are adjustable without pulling the car apart.
2. If you change valley cover to Edelbrock or KC the choke mech is on the carby; early carbs have it on the manifold (divorced choke).

Thanks Byron.

Someone told me the newer carbys were significantly better but if those are the major differences Ill reco mine. It still has the std holden manifold on it. I will chnage the auto-choke senser to an electronic one as the heat one wont work as I think the pipe went to the manifold and I want to keep extractors on it.

Mauser

**HK1837** · 12-09-2011, 09:47 AM

There used to be extractors available for HT-HJ and LH-early LX 253 and 308 that had a U shaped small pipe welded to the RH extractor to allow connection of the auto choke pipe. They are still around but probably not as a new product.

**mauser** · 12-09-2011, 04:53 PM

thanks mate,

When they put the gas on the fuel lines were cut to put the in-line fuel cutoff. The origional lines were the steel ones running up from the fuel pump if I remember. I think these are the best to run and the safest.

The later quadrajets are different in where the fuel inlet location is I think. What models would have the origional fuel lines that would fit my carby and 308? I assume the 253's are different to the 2-barrell.

Mauser

PS I know I have probably got bucklys chance of finding them. :-) ... especially if they were on LH SLR5000's with the torana nuts stockpiling anything origional.

**Kiwivan** · 12-09-2011, 05:57 PM

Make up your own fuel lines with Bundy tubing,Get the new stuff as the old was roledand split on the roll.Easy to do just like your brake lines.

Cheers Kiwivan