General Category > Quadrajet Carb Talk and Tips
1970 350 quadrajet questions. 7040208
hiy_po:
Yer our government has basically made it so we only trade with China. I have tried to make purchases from US and postage and tax turn a $US5.00 into $AU75 it is insane but working for them perfectly as intended. I was trying to buy some tiny grub screws but some of the US companies I approached wouldnt even deal with me because I am in Aus and its all too hard.
If you junk that carb with its stripped out thread I may want to buy your base plate as mine is stuck solid and I may have stuffed it trying to free it.
Cliff Ruggles:
The only heli-coil tap that I know of that's any good is a genuine Heli-Coil and are discontinued far as I know. I purchased the Recoil tap once when I miss-placed my Heli-Coil tap and it's a useless POS. It tried to tear out the threads and chew up the material vs a good clean operation.
I ship overseas daily, and it is getting EXPENSIVE to ship over about 2 pounds to most places, plus customers get hit with import fees on their end as well.
Still doesn't seem to slow things down, I send out orders just about every day to Australia and other Countries across the pond. Even folks over there are tired of getting sub-standard rebuild parts for these carburetors.
Good news if you can get a Demon to work with a chit, I have never had any luck with those at all here dating clear back to when they first came out and they got sued by Holley of patent infringements. Sure I can get them work, and clean up the "pig" rich idle/off idle by going into the metering blocks and airbleeds, but they are NOT reliable in long term service and WAY too many places to leak fuel.....Cliff
Chris_Oz:
Hi Cliff,
The Carb I have on now is the Street Demon 625cfm its a hybrid of an AFB Carter and dare I say QJet, not the Holley copy.
It has pop up pistons and needles etc, but not the tune-ability of the QJet.
Like the "Holley" styled Demons, they are BIG FAT PIG rich just about everywhere. Cruise AFR in the 11's is normal for them, but a needle change can get them back to somewhere usable but not great.
I have been able to find and buy a close but not identical core, it is in very good condition, I would like to know if it would have similar MAB's as my current carb.
Current carb is a 7040208 (1970 Chev 350 truck)
Core carb is a 7041283 (1971 HOLDEN Sedan fitted with 350 SBC)
It does not look like it has been messed with, it is dirty and base plate is worn, but I only want the body as a donor for my carb if it would be suitable.
If you think it would be I will order a rebuild kit and marry the 2 and see how I go.
Are you still taking on repairs?
If I send you my original carb body, can you do the thread repair?
I asked around and I could not find a core for my current carb, the closest I found was a 7040502, which would suit my truck as it was a CA built and sold truck, but I dont know if its MAB's would match up either.
Thanks again
Cliff Ruggles:
Not sure what you'll find in the Holden from that year I haven't worked on one over here.
All of the airhorns on the Chevy carbs from 1970-74 will have the same large MAB's. The truck units in 75-76 will as well, 77-78 are single MAB. Automotive from 1975-80 will have the newer castings and nothing fits your 1970.
The exception in the middle of all that were a few CA emission units around 1977-78 but they really don't apply to what you are doing.
I can repair the inlet threads but shipping is expensive. It would be less expensive to have me find an early main casting and ship it to you. I probably have a few in the core pile, will have to take a look when I get a moment.
I would send it over with the correct gaskets, float, N/S assembly, pump and tuning parts for what you are doing. Then it's basically plug & play........Cliff
Chris_Oz:
Thanks.
I like the sound of that.
Thanks again for your time
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