need a carb. gmc 5.7 350

[jasonroman]

if youve seen some of my other posts, youll know i picked up a 85 gmc.
bunch of things that need/needed fixing. so today i was told carb has issues.
so i was wondering whats a good carb to replace mine with??
i was thinking that since the carb is coming out, i might pick up an eddlebrock intake mani.
i had one of these on my old 82.
not sure on how much either of these parts will run me.
saw holley carbs at pep boys and autozone for like 2-300.
went on summint and put my yr truck and engine. and carbs are 4-500+
so im looking for a little input on whats a good carb to go with?
am i going to spend 200 or 500?
what about the intake mani?

unfortunately, i dont know much about the engines, or parts, or mechanics in general for that matter.
will the carb and intake give me power or just help me have a solid, dependable daily driver??

thanks for any help here fellas.
dude also said i might need a rad soon, as mine is all green and once in a while it will smoke a bit.

tires and lowering kit is now gonna have to wait a bit longer.

[ANDREW]

I think you should just get a edelbrock 600 cfm carb and a edelbrock intake manifold to go along carbs like 300 intake is like 120 im doing the same thing

[jasonroman]

thanks for reply. ill try and find that carb.
thought i read on these forums, but cant find the tread....
that holley carb is better than the eddlebrock one??

where are you getting your parts?
and why the 600 cmf carb?

i am also wondering if eddlebrock 2701 will work on my truck???
guy has a new one for sale on clist for 100 bucks.
whats the difference in numbers?

as for carb. should i just buy one from autozone, eddlebrock or holley and go from there. they are like 300 tops. or should i wait and spend more on a better carb????
id like to do this once. not buy something now and have to swap it later on...

thanks for any help.

[Slonaker]

I went with a rebuilt Jet Performance quadrajet because it cost so much for the adapters on the Edelbrock for my cruise control, air conditioning, etc. Otherwise I would have gone for the Edelbrock 1406. I see a lot of people here and elsewhere reporting that they work very well on a 350 with very little adjusting.

Slonaker

[jasonroman]

Originally Posted by Slonaker

I went with a rebuilt Jet Performance quadrajet because it cost so much for the adapters on the Edelbrock for my cruise control, air conditioning, etc. Otherwise I would have gone for the Edelbrock 1406. I see a lot of people here and elsewhere reporting that they work very well on a 350 with very little adjusting.

Slonaker

hey bud thanks for reply. and your truck looks sharp.
now any more info on that carb??
and info on cost of adapters as my truck has cruise, ac, and im sure etc
looking to buy the right carb. dont wanna pick sometihng up and then run into problems cuz im missing stuff needed.
thanks again.

[dswancutt]

One question for you. Do you have any smog laws to deal with? Just something more to check into before changing carbs.

[Slonaker]

Originally Posted by jasonroman

hey bud thanks for reply. and your truck looks sharp.
now any more info on that carb??
and info on cost of adapters as my truck has cruise, ac, and im sure etc
looking to buy the right carb. dont wanna pick sometihng up and then run into problems cuz im missing stuff needed.
thanks again.

I called Jet Performance at a number I got off their website. Based on my stock engine, they recommended a stage 1 carb (I don't remember which one). I ordered it from Summit. If this link does not work, you can do a search for "Jet Performance".

http://www.summitracing.com/search/B...1-Carburetors/

Regarding the Edelbrock carb, I just looked up the model I wanted on the Summit website, then looked up the adapter/linkage/whatever for everything I could think of that attached to my quadrajet. The Jet Performancce carb isn't cheap, but the Edelbrock was going to cost more with the extra parts. This is especially true if you take into account you will have to run an adapter to mount it to the stock intake, or swap intakes.

If I didn't have A/C, cruise, etc., I probably would have gone with the Edelbrock simply because they are new instead of rebuilt. Edelbrock used to make new quadrajets, but stopped.

BTW, I'm FAR from being an expert. I just wanted to sharee what I did and why.

Slonaker

[TimQ]

FWIW...I tracked down a rebuilt Quadrajet carb last fall for my '86 4.3 V6 for about $210. Search for mountain man carbs on ebay and you will find the guy (just checked, he's selling a bunch of stuff). That price assumes you will return your old unit to him (he covers the shipping) so he can have another to rebuild.

I never touched a car engine before in my life and I was able to take the old one out and install the new one in an afternoon. Once it was in, she started right up and sounded better than ever. Just be sure to label all the hoses and wires. I used tape on both the wire/hose and on the place where it attached to the old unit. Then, as you install the new one, you can just compare the attachment points from the old unit.

Good luck.

[grayharville]

if your trying to keep all your a/c and cruise, get a rebuilt quadrajet and leave the stock manifold. if you dont care about all that crap and just want power, get a summit brand 600 cfm double pumper! cheap, and reliable, and still do good on gas mileage, well, as good as a double pumper on a 350 will get. haha. then maybe a edelbrock performer or performer rpm air gap intake. i picked up a performer for my truck and it made a noticeable difference along with the new summit carb.

[jake wells]

you can buy a remanufactured carb from advance auto. or you can buy a quality rebuild kit and either do it your self with help of course or take it to a good shop.

im gonna tell you if your strapped for cash a kit will run you less than a remanufactured carb.

i hope this link works.

http://shop.advanceautoparts.com/web...carburetor+kit

[irishman999]

I decided to rebuild mine and im very happy with the results. Its not that complicated. The quadrajet is an awesome carb as long as you adjust the float to the specifications and dont mess with the metering rods.

[joebuick]

Hey TimQ, I was reading over your shoulder and tried the "mountain man carbs" on ebay and got zero results. tried without a space in no luck. Got any suggestions? I need a replacement also. thanks

[TimQ]

Originally Posted by joebuick

Hey TimQ, I was reading over your shoulder and tried the "mountain man carbs" on ebay and got zero results. tried without a space in no luck. Got any suggestions? I need a replacement also. thanks

Here's a link to the guy's storefront on ebay.

http://stores.ebay.com/Mtn-Man-Carbu...Fuel-Injection

I have no interest in the business...just had a great experience getting a carb from the guy back in the fall. It's a husband and wife outfit...Ted and Ardell. I almost ordered the wrong unit and they checked and fixed it before shipping.

[jasonroman]

sorry for delayed response. they got me on 3rd shift now.
anyway, im in jersey and i dont think smog is much of an issue. either way, right now i have no cat, so im going to have to buy a sticker for the truck.

as for eddlebrock or jet performance.... if i do get and ebrock and intake mani, will my ac not work any longer? not that i use it. but just wondering.
i know my 82 had an ebrock intake mani and carb. and it looked a lot cleaner than my current set up. my truck now has about 3000 hoses, and lines all over the place. pretty sure that by swapping mani and carb, ill be able to loose the mess and clean up the bay a bit.
and im hoping that it will give me a little bit more power. as well as, GET THE TRUCK RUNNING SMOOTH finally.

i dont think i will be trying to rebuild this carb. or not now anyway. maybe if i find a good carb. then later i might by a rebuild kit and give it a shot.
thinking the carb is like brakes. need it kinda quick and dont wanna learn on a part that might end up with the truck sitting in the driveway as opposed to being on the road.

i was reading that the ebrock will be easier to run than the holley. that the holley takes alot more tuning and adjusting. so i think im heading in that direction. now i just have to look into what ever extra parts id need.???

and i think if i have to spend 2-300 on a carb, id like a new one.
still wondering if i find a carb in autozone or pep boys, if i can just buy it, bring it home and put in without issues or missing pieces.??

[Slonaker]

Your A/C will still work with an Edelbrock carb. You just won't have the solenoid that the quadrajet has to bump the idle up to compensate for the A/C compressor unless you buy it separately.

Your easiest option is to go with another quadrajet because it is a simple matter of swapping old for new. Everything bolts up with nothing else to buy.

You can buy a rebuilt quadrajet or a new Edelbrock at an auto parts store. They will probably have both to choose from.

Slonaker

[HOGDADDY]

Originally Posted by Slonaker

Your A/C will still work with an Edelbrock carb. You just won't have the solenoid that the quadrajet has to bump the idle up to compensate for the A/C compressor unless you buy it separately.

Your easiest option is to go with another quadrajet because it is a simple matter of swapping old for new. Everything bolts up with nothing else to buy.

You can buy a rebuilt quadrajet or a new Edelbrock at an auto parts store. They will probably have both to choose from.

Slonaker

I plan on getting one of Eddy's compenstaors for mine but they are not cheap like close to $100 I think.

[westofb]

You can use the a plain old edelbrock amd the air will work just fine without the solenoid to bump up your idle speed (if it idles too low with the compressor engaged, just simply turn the adjustment screw on the carb and bump up the idle speed, you can always turn it back down...might take 30 seconds labor to adjust the idle speed). I would suggest getting the electric choke version of their carb, you only need an ignition hot wire to work the choke. I used an edelbrock with manual choke that I bought off craigs list...I got the carb, an off brand polished high rise bbc intake and a 14" chrome breather for $150. I would suggest craigs list for these parts if you are somewhat knowledgable about it you can get some smoking deals.

[jasonroman]

can anyone tell me what i would need to buy.
at my local pep boys, they have 1406 and a bit more expensive 1806 carbs
if i were to go with the 1406 for 270
and the intake mani for 140
what other parts will i need to buy in order to install the parts?
intake mani gasket i saw at autozone for like 22 bucks.
are these 3 parts all i would need?

[westofb]

Originally Posted by jasonroman

can anyone tell me what i would need to buy.
at my local pep boys, they have 1406 and a bit more expensive 1806 carbs
if i were to go with the 1406 for 270
and the intake mani for 140
what other parts will i need to buy in order to install the parts?
intake mani gasket i saw at autozone for like 22 bucks.
are these 3 parts all i would need?

That will get you started...no doubt you will need to by some adapters for the throttle linkage, if the 1406 is manual choke, you will need a choke cable, maybe an adapter or two for some of the vaccum fittings (including the power brakes...might be able to make your old set up work with a few bends to the line), and perhaps some fittings for heater hoses and/or some plugs for extra holes (vaccum and water) in the new intake that are needed. Hopefully you can get your throttle bracket/ kick down braket to work, it may have to be modified to fit also.
There is really no "bolt on" system to replacing stuff with after market parts, you will have to modify somethings to work, by adapters for those that can't be modified. If you are looking for new stuff, look at Jegs and Summit, both at times offer reman Edelbrock Carbs at a substanial savings (they are guaranteed just like the new ones and look as good as new too).

Oh yeah, you will probably need a carb gasket too, if the carb comes with one it will be a really thin and cheap one. Probably need to get some carb studs/ bolts also to attach carb to intake.

[jasonroman]

Originally Posted by westofb

That will get you started...no doubt you will need to by some adapters for the throttle linkage, if the 1406 is manual choke, you will need a choke cable, maybe an adapter or two for some of the vaccum fittings (including the power brakes...might be able to make your old set up work with a few bends to the line), and perhaps some fittings for heater hoses and/or some plugs for extra holes (vaccum and water) in the new intake that are needed. Hopefully you can get your throttle bracket/ kick down braket to work, it may have to be modified to fit also.
There is really no "bolt on" system to replacing stuff with after market parts, you will have to modify somethings to work, by adapters for those that can't be modified. If you are looking for new stuff, look at Jegs and Summit, both at times offer reman Edelbrock Carbs at a substanial savings (they are guaranteed just like the new ones and look as good as new too).

Oh yeah, you will probably need a carb gasket too, if the carb comes with one it will be a really thin and cheap one. Probably need to get some carb studs/ bolts also to attach carb to intake.

kinda wish there was a kit. my luck ill purchase the parts i think i need. and when it comes install time, ill be stuck missing pieces and more time with truck down.

[scottsdaleowner75]

Not to thread highjack but i was wondering where does the mixture control solenoid (white plug at front of carb) wire into? One goes to the connector on top of the thermostat housing and the other to...? BTW looking at it i think this is the carb the OP needs http://cgi.ebay.com/ebaymotors/ws/eB...tchlink:top:en

[Slonaker]

Originally Posted by scottsdaleowner75

Not to thread highjack but i was wondering where does the mixture control solenoid (white plug at front of carb) wire into? One goes to the connector on top of the thermostat housing and the other to...? BTW looking at it i think this is the carb the OP needs http://cgi.ebay.com/ebaymotors/ws/eB...tchlink:top:en

I can't remember where the other end goes. I think it attaches to a wire on the passenger side valve cover, but where it goes beyond that I can't remember.

That may be the correct replacement, but i would use an earlier one without the mixture solenoid. It is just a little more complication that is unnecessary. I replaced mine with an earlier model.

Slonaker

[streetstar]

I'd probably stick with a rebuilt Q-jet for that engine, -- the best combination for power and economy for a mild motor (plus all the factory style fittings should be there)

[jasonroman]

Originally Posted by streetstar

I'd probably stick with a rebuilt Q-jet for that engine, -- the best combination for power and economy for a mild motor (plus all the factory style fittings should be there)

well it looks like im gonna be staying with what i have for a while.
havent driven truck since swapping wires around and getting rid of the poppping. holiday weekend was spent with family and no truckn at all.
today i come home from work to find a new drop under truck....
havent moved it in about 4 days....and now i have rad fluid dripping out from under truck....
so i guess ill have to get rad fixed before anything else.

[jasonroman]

ok. so today i left work and dropped truck at shop to get inspection done.
passed.
on the way from work to shop, truck seemed to ride fine, UNTIL i reached 30-45 mph. in that range, there was this, missing/hesitation. with a little back fire here and there from exhaust.
if i go from stop and accelerat thru them speeds, there truck moves fine.
but if i drive normal, nice and easy and dont push truck, it happens.
the truck back fired from exhaust a couple times... then shut off.
i put it in nuetral and it fired right up. couple more misses and i was at shop.
left a note to check it for me....well nothing was checked.
stickers on, but nothing checked.
would this be happening if my timing is off, or too advanced or do i have other more serious problems??
sometimes if drives fine, and dont miss thru that speed, but most of time it does.
on the way home, it was pretty much the same. at them speeds, it would bogg,mis,hesitate.
and then there was this loud pop...gunshot like....just 1.
wasnt sure what happend but after pop, truck seemed to drive fine. even thru them speeds.
but naturally, it didnt last.
a little while later, same issues around them speeds???
any thoughts?