rah72(Rick) Posted February 7 Posted February 7 Quite a few years back I bought a Q-Jet from one of the members her( to many for me to remember who I bought it from ). Well I am finally looking to have it rebuilt with upgraded bushing s and the like from one of the guys who use to work with the master Cliff Ruggles. To shorten the whole post. It appears that the carb I have which came of said memebrs 1972 Monte, found in researching the numbers the carb is actually a Carter built Q-Jet off a 1973 GMC truck. Both the master and the guy it looks like I am sending it off to get rebuilt, said this carb will work with no issues. What I am looking for, is a few pictures of the carb on their stock 350 4bbl to make sure everything from the outside should match , as in the kickdown cable and the electic choke setup. So if someone has a few pictures it would be great if you can send them or post them here so I can get my butt in gear and get this carb returned to a oem(ish) piece EDIT:::: I just found and looked at the numbers on said q-jet. It appears it is a original from a 72 MC # 7042202 A2 DJ in looking 704( model years used 70 to 75 ) 2 ( model yr 72 ) 2 ( fed or Cal emissions 2 everywhere but Cali ) 0 ( 0,1 and 2 stand for Chevy ) 2 ( automatic Trans ). Looking deeper into the numbers this could have been a original unit for my car the A2 stands for A ( jan ) 2 ( model year ). my car came of the line first week of june of 72. Thanks, Rick 3 Quote
rah72(Rick) Posted March 5 Author Posted March 5 On 2/8/2025 at 2:18 PM, Scott S. said: Hope this helps..... This helps a ton thank you. I wasn't sure on a couple things on this carb I have that I couldn't remember from having my first car back in 1983. my carb looks identical just not sitting on a motor at this time Rick 1 Quote
Scott S. Posted March 5 Posted March 5 Anytime.... We're all here to help....... And have a few laughs along the way. 3 Quote
McCall72 Posted March 6 Posted March 6 Hi Rick, I have the Quadrajet 4 barrel I took off my 72 years ago just sitting in a box if you want it for just the price of shipping. This was the Qjet the car was built with. Quote
cny first gen 71 Posted March 6 Posted March 6 I don't remember any of them having electric choke, they have the little spring thing that sits in manifold that opens choke open as it warms up. I do remember having to modify mine a bit because of using aftermarket manifold. 2 Quote
Scott S. Posted March 6 Posted March 6 This one isn't an electric choke, the wires are a part of the distributor advance. 2 Quote
rah72(Rick) Posted March 7 Author Posted March 7 On 3/6/2025 at 7:02 AM, McCall72 said: Hi Rick, I have the Quadrajet 4 barrel I took off my 72 years ago just sitting in a box if you want it for just the price of shipping. This was the Qjet the car was built with. I have one, just wanted to verify the one I have was from a 72. I am not a fan of the edelbrock that was put on the car. I will be sending out mine to a guy who use to work for the Quadrajet guru Cliff Ruggles. And was just clarifying what I have is correct. But if for some reason I have a issue with this one I Will hit you up. Thanks, Rick 1 Quote
rah72(Rick) Posted March 7 Author Posted March 7 On 3/6/2025 at 12:53 PM, Scott S. said: This one isn't an electric choke, the wires are a part of the distributor advance. Scott, Let me ask you this question, in this picture I have a blue circle. Where does this plug into? Have you ever had to do anything with it or make any adjustments? I am pretty sure I remember all the vacuum lines( connections ) and any other connections I need to make. Need to find my old service/repair manual I had from my other cars. Thanks again for your help Rick Quote
Scott S. Posted March 7 Posted March 7 Hi Richard, The part circled in blue is the "idle stop solenoid".... I'm assuming it has a purple wire ('70 Monte) It's purpose is to prevent "dieseling", there's a whole forum here on what it does. The purple wire basically runs back to the coil to ground out the ignition if the solenoid circuit closes. (Dieseling condition) 2 Quote
rah72(Rick) Posted March 8 Author Posted March 8 58 minutes ago, Scott S. said: Hi Richard, The part circled in blue is the "idle stop solenoid".... I'm assuming it has a purple wire ('70 Monte) It's purpose is to prevent "dieseling", there's a whole forum here on what it does. The purple wire basically runs back to the coil to ground out the ignition if the solenoid circuit closes. (Dieseling condition) yes that is what I thought that was, now I just need to see where the wire runs( if the person who put on the edelbrock left the wire in place, although not really sure that solenoid is needed ). And need to figure out if the divorced choke stuff is still in place on my car. Quote
Scott S. Posted March 8 Posted March 8 Quick question Rick..... You mention an aftermarket intake, are you using an H.E.I. distributor as well ? The whole idle stop system was more geared for factory/emissions systems than aftermarket usage. I've added the factory wiring diagrams ('70) to help you locate where the wire should go. Scott. 3 Quote
rah72(Rick) Posted March 12 Author Posted March 12 On 3/8/2025 at 2:43 PM, Scott S. said: Quick question Rick..... You mention an aftermarket intake, are you using an H.E.I. distributor as well ? The whole idle stop system was more geared for factory/emissions systems than aftermarket usage. I've added the factory wiring diagrams ('70) to help you locate where the wire should go. Scott. No aftermarket intake on my car. everything but the carb is OEM. Yes my car has a HEI distributer, not sure what it is out of though. It kind of sounds like the idle stop solenoid isn't needed now as much as it was needed back in the day. I am going to pose that question to the guy I am sending the carb out to for the rebuild Quote
Scott S. Posted March 12 Posted March 12 To be honest with you Rick, I don't believe the "points type" idle stop solenoid can work with a n HEI ignition.... But I haven't used a points type distributor in forever. Quote
Rob Peters Posted March 12 Posted March 12 1 hour ago, Scott S. said: To be honest with you Rick, I don't believe the "points type" idle stop solenoid can work with a n HEI ignition.... But I haven't used a points type distributor in forever. I would disagree with this statement. The idle stop solenoid has nothing to do with the distributor or HEI ignition system. My understanding is the only portion of the ignition system it uses is the key being turned on. When the key is turned to the on/run position it energizes the idle stop solenoid The idle stop solenoid position is first adjusted with the key off and the motor not running. The solenoid position would be adjusted at the lowest point of the throttle travel. The bolt on the solenoid which comes in contact with the is adjusted with key in the on/run with the engine running and the solenoid energized. Once the engine is warmed up and the choke open you would then adjust the bolt sticking out of the end of the solenoid for the desired idle speed. The idle stop solenoid is meant to stop dieseling once the key is shut off. So, when the key is shut off and the solenoid deenergizes and drops the engine below idle speed so it basically starves the engine of gas. With no gas flow it prevents the engine from dieseling/run-on. With a stock carb and no idle stop solenoid or a non-functioning idle stop solenoid it doesn't stop the gas flow and sometimes will, with just the heat in the engine, allow sometimes allow the engine to shake and run-on without the ignition turned on, no matter what kind of ignition system you have installed. All that said, I am not sure about after market carbs and what system they would use to prevent engine dieseling/run-on. rob Quote
Scott S. Posted March 13 Posted March 13 Thanks for clearing that up Rob, I wasn't exactly sure if the different types of coils had any effect on how it worked. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.