hey i posted this in the 60's section, but would like some more imput. what are ya'll running? if i go to a q-jet, is there a model that is better than others? thanks. the link is: https://forum.ih8mud.com/showthread.php?t=76318
carb question sbc guys
- Thread starter saint60
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
older quadrapuke like late 60's to mid 70's rebuilt are pretty good no major emission stuff etc. pretty good carb but harder to work on or adjust like a holley.
my self i am a holley guy, but i build my own. i like the 600 cfm with spring loaded needle and seat's and floats and set the floats a little low to keep from flooding and extend the bowl vent too and make sure you put in one of the one way valves to keep from blowing out the power valve. holley's are so basic and easy to work on. just my $. 02 good luck!!
my self i am a holley guy, but i build my own. i like the 600 cfm with spring loaded needle and seat's and floats and set the floats a little low to keep from flooding and extend the bowl vent too and make sure you put in one of the one way valves to keep from blowing out the power valve. holley's are so basic and easy to work on. just my $. 02 good luck!!
- Joined
- Apr 14, 2004
- Threads
- 1,373
- Messages
- 34,747
- Location
- 818-953-9230
- Website
- www.marksoffroad.net
Early to mid 70s QUADRAJET .......ALL THE WAY!!!!
If you’ve ever heard the expression that imitation is the sincerest form of flattery, then consider that Holley and Edelbrock both offer their own versions of this legendary carb. The spread-bore design gives you low end torque and fuel economy, combined with secondary passing and top end. It just basically does it all!
If you’ve ever heard the expression that imitation is the sincerest form of flattery, then consider that Holley and Edelbrock both offer their own versions of this legendary carb. The spread-bore design gives you low end torque and fuel economy, combined with secondary passing and top end. It just basically does it all!
- Thread starter
- #5
i have been googling rochester qjet and i don't see any different model numbers. are the qjets pretty universal? the only differences i see are for small blocks and big blocks. and what differences are there in years? is ebay the best place to get one? is it best to get one and rebuild it? or get one that says it has been rebuilt? thanks.
- Joined
- Apr 14, 2004
- Threads
- 1,373
- Messages
- 34,747
- Location
- 818-953-9230
- Website
- www.marksoffroad.net
saint60 said:
There are a TON of different models, manual vs thermal choke, with and without a/c idle compensator etcetera, etcetera,etcetera.
I've never looked for one on Ebay, so I couldn't honestly answer that question.
If you find one on Ebay or thru classifieds, ask the seller for the ID number on the carb. Many times you can figure out the year it was offered from the ID #. There's prolly a site somewhere on the web that has that info as well.
As far as rebuilding goes, they're fairly straightforward to clean. The trick is in the assembly. The accel pump linkage weaves into the pump arm, requiring you to tilt the airhorn onto the fuel bowl. With the metering rods dangling from the air horn, and the vent tubes requiring very careful insertion into the bowl, this is the most critical part of the assembly. Reconnecting the choke linkage, which drops into a pocket of the fuel bowl, is a nuisance, but a bit easier than dealing with the metering rods and vent tubes.
If the core doesn't cost you much, you have little to lose in trying it yourself. If you're just curious as to the complexity of the unit, you could try walking into a local pick and pull and disassembling one of theirs in the yard just for kicks!;p
- Thread starter
- #7
on qjets is there a way to adjust them for offroading as far as floats and stuff? or is it just a matter of the square bore/spread bore thing? i'm looking at a rebuilt one that was for years 74-76 with an electric choke. do you think that will work? thanks.
I used to work at Auto Zone when I got my Q-jet so I picked out an early manual choke non emisions version. I will dig thriough my recipts tonight and see if I can find you a part #. It was about $100 with a lifetime warrenty and I have had zero problems with it. Just set the idle and go.
- Joined
- Apr 14, 2004
- Threads
- 1,373
- Messages
- 34,747
- Location
- 818-953-9230
- Website
- www.marksoffroad.net
Big B. said:
Check the title of this thread, then the glossary of abbreviations; SBC!;p
In my beefed up hot rod days ,I had a72 c20 with a built up 383 ran th rochester q jet(early -mid 70's)Good carb run around town with just the two barrels open jump on it and watch out ,if you didn't breack you were gone!
Then I got a 61 step side chevy,came with a nice(puke)holly600 double pumper i believe?swaped moters out bumped up 383 p&p dart 2 heads b & m z gate floor mount shifter dropped front end ,88 chevy rear end ,69 camero rear mount gas tank .....aaaaahhhhhhh that thing was a beast after i swaped out the holly for another q jet! easy to set up, rebuild ,and they tend to stay in adjustment!!!!!
Just my .02
Then I got a 61 step side chevy,came with a nice(puke)holly600 double pumper i believe?swaped moters out bumped up 383 p&p dart 2 heads b & m z gate floor mount shifter dropped front end ,88 chevy rear end ,69 camero rear mount gas tank .....aaaaahhhhhhh that thing was a beast after i swaped out the holly for another q jet! easy to set up, rebuild ,and they tend to stay in adjustment!!!!!
Just my .02
I just installed a Holley Truck Avenger. We'll see how it does.
J.R.
J.R.
I have a half dozen Q-jet writeups I pilfered from the web and reformatted for easier reading. Thorough info on theory, tuning, rebuild, troubleshooting. 740 Kb in 6 Word docs. Email attachments or FTP to anybody who needs them. Let me know by email - I check it more often than mud.
email theo
email theo
