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rippley
Novice

Feb 24, 2014, 1:14 AM

Post #1 of 16 (1162 views)
  post locked   post icon carborator  

I have a 1976 chevy with a 1974 350 im having my carborator rebuilt but need to still get to work my friend loaned me a 1985 GM 1618251 ignition spark module kent-M my truck dont have the ignition spark module wireing can i still use the carborator till Friday with out hooking the ignition spark module on the carborator up . I have 4 hours before work id appreciate some advice (personal info removed) Jeremy


(This post was edited by Tom Greenleaf on Feb 24, 2014, 2:30 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 24, 2014, 2:40 AM

Post #2 of 16 (1115 views)
  post locked   Re: carborator  

? Why not just use the whole distributor from the 1976? If all were 350s they should be fine for wiring for distributor. 1985 almost all were using assorted modules for HEI which started in all real GMs in MY 1975. Late carbs had assorted electronic controls that varied so you would spend more time matching things to make that long a time up to 1985 work.


What are you doing on what kind of vehicle? Watch out as a Chev 350 may look all the same at a glance but be totally different in critical ways,


T



rippley
Novice

Feb 24, 2014, 2:59 AM

Post #3 of 16 (1108 views)
  post locked   Re: carborator  

It on a 3/4 ton Silverado. I don't have the other distributor. This other carb has two plugin on the front of both sides my truck was not equipped with th esse m being an older model and i have no idea were to run a wire from to the carborator to make it work. Do I have to have them pluged in


Tom Greenleaf
Ultimate Carjunky / Moderator
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Feb 24, 2014, 3:37 AM

Post #4 of 16 (1097 views)
  post locked   Re: carborator  

Get the right distributor if you are serious about this to be original or building something custom. Wild differences even in now an antique vehicle. A 350 is not just a 350 as said. Automobile all different than what would be possible for trucks up counter rotating and the cars were not - watch out.


There was a book of choices for carbs to be precise for each. Just for GM in the general years FYI, 1972 body style ended, '73 stayed for a while but last point distributor was MY (model year) 1974 then HEI (high energy ignition) was the rule along with cat converters for light duty trucks but not heavy duty or all places they were sold so it is and was a mess. Carbs went from exhaust heated automatic chokes to electric boosted or totally electric - you need stamped carb #s for each for specs.


HEI used a couple modules and I'd have to look up each one possible. If just inside 4 plugs spades those are usually all the same.


If not too late and depending on what you are doing either just making this a usable truck or a restoration make sure items and parts you have are a match with total core replacement including the block of some 1974 350 making sure it's a match or not. I have no software or even paper books left around that would only be specs and diagrams not interchangeability - the salvage yards have that but might not go that far back with all.


You'd think at the age this would be free from details that will mess you up but it's not even within same model year that engine was made for cars or trucks and either with or without California emissions, and strong for marine or other uses not automotive at all.


If you intend on building a custom truck out of this you still need items to be compatible. Not as easy as these look at a glance,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 24, 2014, 3:37 AM

Post #5 of 16 (1094 views)
  post locked   Re: carborator  

One is an 0/2 feedback system and one is not. They are not interchangeable.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
Veteran / Moderator
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Feb 24, 2014, 8:37 PM

Post #6 of 16 (1067 views)
  post locked   Re: carborator  

I'm a little confused but it sounds like your friend gave you a 4 barrel QuadraJet to use???.. Those have mixture control solenoids in them and like you already know....Your truck doesn't have a computer....

If you are swapping Qjet for Qjet.....it should bolt up & would probably start.....But it would more than likely being running really rich....You should really look at different transportion options and not create more problems for your truck...

76?? That should have had HEI ignition in it.....even a 74 should have had it......You are running a points dist??? If so you should swap it back.....That is one of the easiest conversions there is......All you need is 1 12v wire.....Thats why the hod rodders love those dist, which makes them hard to find some times.....






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Tom Greenleaf
Ultimate Carjunky / Moderator
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Feb 25, 2014, 3:01 AM

Post #7 of 16 (1063 views)
  post locked   Re: carborator  

'74 model was last point distributor for GM. This has crossed the changes from leaded to unleaded (most likely) and ignition from '74 to '76 and was looking that most seemed to be Quadrajets that would fit but not be right or just drop in and work.


Old distributor missing - shame. IDK but this project isn't starting off well. Where's the original engine even if dead?


T



rippley
Novice

Feb 25, 2014, 6:56 PM

Post #8 of 16 (1050 views)
  post locked   Re: carborator  

I am running HEI . I just didnt know were the two plug-ins on the front of the carborator need to be connected at


rippley
Novice

Feb 25, 2014, 7:08 PM

Post #9 of 16 (1048 views)
  post locked   Re: carborator  

The old motor was a 454 i throw 5 rod n3 main bearings i am using the original dist from the 350 ive got about 3500 miles on the motor. Carborator started acting up . This other carborator has 2 plug-in on top front i was curious to find out if i can use the carborator were do i run the 2 electric plug-in at coming out of the carborator to the truck


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2014, 7:09 PM

Post #10 of 16 (1047 views)
  post locked   Re: carborator  

As I've already told you. that carb is electronic and used with a computer and 0/2 sensor to regulate it. It will not work on your car.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
Veteran / Moderator
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Feb 25, 2014, 10:27 PM

Post #11 of 16 (1037 views)
  post locked   Re: carborator  

That plug is for a mixture control solenoid.........Those carbs were computer controlled.....Your truck doesn't have a computer,,,,So like HT was saying.....it won't work....

I honestly can't remember if those go full rich or lean when left unplugged....I'm thinking full rich but it really would be better to try something different....or just rebuild the carb for the truck......It doesn't take that long......soak it overnight is some dip & even a novice can kit those in a few hours......After you set the float level just hold the carb upside down & float should be pretty level with the body when it drops down (actually up...but its upside down)......use an 1/8" drill to set the choke pulloff (between the top air flap & body), you'll see where to bend the linkage.....Just follow the instruction with the kit & you should be good.....






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Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 25, 2014, 10:58 PM

Post #12 of 16 (1034 views)
  post locked   Re: carborator  

ripley: I know this is messing you up and it's because of several things all different and poorly archived for the engines and model years. Truck stuff is not automotive but looks similar. These years trucks were exempt from some things new and cars were not plus add versions for CA emissions, high altitude rated settings and total changes in designs to accommodate that.


That makes carbs for many for those years a nightmare. Most seemed to just give up and toss on an aftermarket with tons of adjustments to at least make them run well as possible.


Example: Here's the carb replacement that might be used new on the 454 4V depending on where sold..........



On a car that would be different but still a Quadrajet. Your electric connections were to a metering rod in the float bowl vs just let it plain mechanically decide as that's controlling fuel mixture and that plugged in to top of the carb in that pic. IMO, if correct CFM this carb would work and just leave the plug hanging and forget it.


So the model years involved, truck vs car specs, CA or high altitude emissions, change of engine size completely really causes hair loss! Info with everything all OE was tricky - I was there with these thing new and things got messed up. Keep in mind both 454 and 350 blocks were made for clockwise or counter clockwise rotation so they invented hair replacement/growth tonics!


Anything can be done but this is just being two puzzles with missing pieces to make one and just going to be a challenge.


Hard to be accurate to help you with this or what to suggest. I guess just take each small problem or question one at a time and see how it fits in this puzzle,


Tom






That is creating the hassles IMO.



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 26, 2014, 4:42 AM

Post #13 of 16 (1027 views)
  post locked   Re: carborator  


Quote
Your electric connections were to a metering rod in the float bowl vs just let it plain mechanically decide as that's controlling fuel mixture and that plugged in to top of the carb in that pic. IMO, if correct CFM this carb would work and just leave the plug hanging and forget it.


No, as already explained to him many times, that is an electronic mixture solenoid with a TPS that is operated by a computer that this car does not have so NO, it will not work. Sidom has explained this very accurately although I would warn against trying to rebuild your own carb. If there is mechanical wear in the throttle shafts and other places, you cannot correct that yourself so for that reason I suggest you purchase a remanufactured unit. They are still readily available online.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



rippley
Novice

Feb 26, 2014, 5:58 AM

Post #14 of 16 (1015 views)
  post locked   Re: carborator  

Thanks to all the replys to my question. Im not using the electronic carborator that was gave to me my old carborator will b ready friday. I was just trying to understand were the plugins went and y i couldn't use it with all the help yall have given i have an understanding thanks for all the schooling


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 26, 2014, 6:03 AM

Post #15 of 16 (1014 views)
  post locked   Re: carborator  

You're welcome............

I will close this now as solved to keep the spammers out.

You can request to any Mod if you need it re-opened.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Feb 26, 2014, 7:11 PM

Post #16 of 16 (1003 views)
  post locked   Re: carborator  

Just wanted to add that you can't use a computer controlled carburator if you have no computer to control it < just thought I would add that > LOL sarcasm.





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