Hi all,


My engine has a hard time starting and I found out that choke is removed. So I'd like to put it back on but not sure how. The carb has a divorced choke but I don't know what the intake initially had. So some background info that might be useful: I have a 1973 Corvette engine. Below is the serial number.





The carb is a Rochester Quadrajet shown below with part number 7045213, which seems to be from 1975.








The choke is removed and there is a zip tie holding it (not sure what the purpose of the zip tie is)





I'd like to rebuild the carb so I removed it. The intake is a GM intake, but has a plate bolted to where the divorced choke would have gone shown below. The plate is at an angle:







I saw that the normal divorced plate should have an intake like this, with a circular notch/hole where the raised portion of the thermostat would sit:





first question is, what intake do I have and what was the carb that originally came with it?


second, I saw here (link below) that someone put an Edelbrock 8901 performance series choke kit plate where my plate is. What thermostat kit would I use to make the rest work? I've seen 5 piece Rochester choke kits on eBay but not sure if they fit.

https://www.corvetteforum.com/forums...jet-choke.html


lastly, I've also seen electric choke conversion kits, but didn't find any that would fit my carb based on the serial number, any suggestion here? they also bolt to the intake and right now I only have that plate there.


Thanks all.

 

I'm not answering your questions but one thing you should do when getting it back together is replace the rubber hose fuel line from pump to carb with a steel line. This is a dangerous situation as these hoses can deteriorate and leak. These steel lines are available from Vette parts suppliers. Good luck.

 

ok, choke is still there, just unhooked. and held halfway shut. looks like correcr orig intake. get the numbers off the side of the carb. they will tell you if it is correct and most likely original or out of an 80 truck. how much do you know about these carbs? Lars. v8fastcars@aol.com is the guy to send yours to if he will accept it.

 

start over. put carb back on. hold choke shut and start it. does it start good? then cut the tie wrap when warm and see if it runs better with the choke fully open. now decide if you need carb work or choke hooked up. there are zillions of q jets on ebay cheap. look for one with the correct choke and may even have the divorced part attached. putting this on and setting it up is not rocket science. old car science, kind of... here is an example. https://www.ebay.com/itm/11486890172...temCondition=4 also shows the numbers you are looking for on the left side. says date built and what engine.

 

divorced choke. i am sure oem can be found. looks like the rod goes in the hole the tie wrap is in and good to go. https://www.ebay.com/itm/28434527739...gaAh08EALw_wcB

 

Or is it this style? My 75. The problem with both of these set ups, is you need exhaust crossover heat to run them. That’s why the electric conversion is usually preferable. no, looks like first style.

 

7045213 shows as a 75/76 HD truck carb.

The truck manifold I had had a different well for the choke coil.
A divorced electric choke kit may be the easiest to install, with a little fab work to mount it to the manifold that is already on the engine.

https://quadrajetparts.com/electroni...4305465401fadc

I'm not saying the above is the one the OP needs, something similar could be made to work.

This is the type of well I'm used to seeing for the choke coil on trucks:

 

thanks for the tip, I just bought the car and it came like this. I will look for a hardline to the carb.

And full disclosure, the car is not a Corvette. I feel like an imposter posting here, but the engine is from a Corvette so I thought you all know best how to answer my questions and I was right. The truck is a 1965 FJ45, with this 350 engine in it. I love the 70's corvettes so at least I can say I got the engine. I just bought the car and it had been sitting for over a year. So I am sure the carb needs some kind of clean up.

 

I know almost zero about these carbs, but I am learning from reading and watching videos. I just disassembled it and it wasn't bad. I've rebuilt motorcycle carbs which are simpler, and I am hoping to do this myself, or at least attempt.

 

the bolt pattern on the plate on the manifold looks very similar to what I have. Is this the hot air variation of the thermostat? All the divorced chokes I've seen on eBay have one bolt, and a raised **** on the bottom and are not direct fit to my intake manifold.

 

Thanks and I like your thinking. I decided to not mess with the choke for now, just put the carb on and run it the way you described and see what happens. But I will rebuild the carb first, I bought the rebuild kit for it and just disassemble it, since I am pretty sure it will need a rebuild after it's been sitting for such a long time.

 

Your carb is a commercially rebuilt (meaning it's been badly hacked and destroyed) carb off of a 1975 1-ton GMC truck. It's not a good match for your car, and I'd suggest you start a quest to locate an unmolested, non-hacked, rebuildable carb off of a 1973-1974 Chevy passenger car. Your intake manifold is a hot-air manifold used with 1975-1979 350 engines equipped with a hot air integral choke. That manifold is not compatible with the correct 1973 type divorced choke carb.

I wouldn't mess with rebuilding that carb: It has problems and issues that are way beyond the scope of a basic rebuild. E-mail me for my paper outlining the problems that will be present in that carb. You have a real bag of worms...

Lars
V8FastCars@msn.com

 

There is so much wrong going on in those pictures, the best approach to this is to start at ground zero. You have a 1973 engine, 1975 something carb, 197? intake and a 19?? Corvette. Bubba has run plug wires, electrical wires and rubber hoses all over that engine bay in a haphazard fashion. As already pointed out get rid of the rubber fuel line going from the fuel pump to the carb.

I assume you are trying to have a somewhat stock appearance that performs as it should so the best starting point is to pick a year to work off and build around that. Right now you have a mix bag of parts that don’t work together. Having said that there is nothing wrong with using incorrect model year parts if they can function together.

Keep asking questions, people on this form are a great source of information and always ready to help.

 

Unless the Vette needs to be original......there is no problem using Q-Jets and intakes from other years......
My fave years are the 77-80 Q-Jets with the thermo choke......they are super easy to convert to electric.

Keep an eye out on E-Bay....good Q-Jets come up all of the time.....
One thing I never see in the sale/wanted is a C3 owner putting a wanted for a good rebuildable core......lots of us have them. I recently sold all mine off except for three...
Edelbrock made good Q-Jets and they pop up from time to time too....I have one. They are all 20 years old maximum too.....

Jebby

 

Your easiest and best option to avoid an intake manifold change is to find a good, used, unmolested, rebuildable 1976 - 1979 Q-Jet off of a Chevy passenger car. Convert it to electric choke and do a nice setup on it. It will run perfectly. I don't include the 1980 in my year preference since the 1980 carbs already came with an electric choke. They are also much more expensive than the pre-'80 carbs since far fewer Chevy passenger cars came with 4-barrels in 1980 than in previous years, and you pay a premium for the electric choke. I also include the 1976, since it has the advanced APT feature (first year) and is practically identical to the 77-79 carbs. I do not include the '75, since it does not have the good APT adjustment feature, and it utilizes the rear choke pulloff, which is no longer available.

However, if your end goal is to get your '73 back to a more "correct & original" appearance, you need to locate the correct intake manifold with a correct carb, along with the divorced choke system and components to make it all work as it did in '73.


Lars

 

What is going on in Post #1 / Picture #2 in the upper left corner of the firewall, I don't recognize any of that linkage or wire wrap cabling stuff? Are we even looking at a Corvette engine bay?

 

It's definitely not a Corvette - looks like the OP has a truck. As he stated, he has a "Corvette engine..."