Carb motor in a 99 silverado?

Ok my truck has been a real pain for the past 2 years. So today i picked up a cheap daily. Now i want to get my 99 nbs running again.

Heres the catch and dont flame me this isnt for race purpose. This is strictly to drive to shows and on occasion now.

I want to put a carb'd chevy small block in this truck. Eliminating most of the electrical crap and computer.

What all needs to be done here? I know i will need the motor and get mounts to bolt it in. I plan to usd a msd ignition source to start it etc.

Now is there anyway to mate the motor to the 4l60e? Also How will the alternator and stuff wire back up since i wont have a engine harness anymore.

I just need to know what all its gonna take to do this conversion, I dont want to hear put a lsx motor in it because this is cheaper and will get the job done for what i need.

you'll need an older 700r4 tranny or th350.

Will still a deal of wiring to do, since this obviously isn't your area of interest (based off other problems) I'd find a buddy that's good with cars :)

i'm not 100% sure on motor mount fitment. Might need a cowl hood to clear the carb. Will be better off using aftermarket gauges since your cluster will be useless. Will need fuel regulator to knock down to 5.5-7 psi or so. Special downpipe, vac advance distributor.

4.3's are 350's with 2 cylinders missing so...

Yea i didnt know if i had to swap the tranny or not. I dont mind doing the wiring but i hate searching for a problem and seeing nothing but everything i try refuses to work.

I plan to run aftermarket gauges custom fit in a custom cluster. Also gonna take the fuel pump apart and replace the in tank with one that has the right pressure for a older motor. Exhaust will be taken care of. Distributor is gonna be bought with ignition.

Heres one thing im confused on.
Summit SUM-220104-B - Summit® Dual Feed Fuel Lines – SummitRacing.com

i know this is whats used for the carb fuel line and will connect on my supply line from the tank. But what will the return line connect to?

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Originally Posted by GasGuzzler

4.3's are 350's with 2 cylinders missing so...

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I know. Not looking for speed. This is for simplicity. I wont be using this vehicle much anymore so just doing this so it will atleast run. Also its a project now so it will be an enjoyable thing to do.

I was answering the ease of swap question.

This swap is just to have it running. And i no longer want all the electronic stuff to mess with.

sounds like alot more electrical issues to me....IDK

Well its what id like to do. its better than it sitting and never being worked on.

Also it would be cool at shows imo old school motor in a newer truck bagged and bodied. just something different

i forgot he had a 4.3...wasn't sure if the 4.8 ls series use same motor mounts as older blocks

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Originally Posted by oleshifty

i forgot he had a 4.3...wasn't sure if the 4.8 ls series use same motor mounts as older blocks

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so would a 305 350 mount up to my frame mounts?

yessir. And a 700r4 should be same size as 4l60e, you'll just have to run vac line to the module.

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Originally Posted by oleshifty

yessir. And a 700r4 should be same size as 4l60e, you'll just have to run vac line to the module.

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Turbo 350 isnt the same size? they seem to be easier to find but it really dont matter to me what tranny is in it. Also what do you mean vac line to module?

Also will whatever line connects to my transmisson to shift it from park work on the older style tranny?

What will swap off my motor accessories wise? Alt starter power steering a/c?
How will the alt wire back up with no engine harness?

And i know how the supply fuel line connects but what about the return line? and idk much about engine so the older engine has a egr valve what will that hook up to?

How bout this?!?!?!?

Get a LSX motor from a yard. Prob anywhere from 500-1K.

MSD sells a kit that gives you a MSD box and intake to run a carb on a LSX engine! Retains the crank sensor pulse so you can use all 8 coils. But you get to run a carb that sits on a edlebrock non-Fuel Injection Intake.

And you don't have to mess with motor mounts, headers, etc...

Then let the computer control the tranny. Or th350 or th400

Edelbrock 7118 - Edelbrock Performer LS1 Intake Manifold Kits – SummitRacing.com

If you're swapping motors, you'll never pass emissions, so ditch the EGR

older trannies shift off vacuum, so you'll have to run a line. Also need to run a kickdown cable to the carb. Not sure if a th350 will fit your crossmember correctly, ask someone that has a th400 on here (there are a couple, i just can't remember who). If not a 700r4 has overdrive, which is nice.

Alternators need a big cable going to a battery/starter, and a small wire running to a gauge to charge. i'm sure SOMEONE knows what color wire it is from factory, if not an aftermarket gauge SHOULD work. If you run your current accessories you'll just have to cut the plug to the alt, and run to your new gauges. But as stated above, it's A LOT more wiring then you think. You'll need to know what to cut/what not to cut, will have to remove airbag system, ABS might not work after, could influence turn signals/brakes/etc if you cut wrong wires.

i was told they make adapter plates for the 4l60e and 80e. im going to try and drop a 80e that i have into my 67 camaro and im running a 327 from 67. a buddy of my said he did it to his 57 chevy and knows multiple people that have done it

Your project would no longer be street legal. If it were me I'd find a competent technician to find and solve current electrical problems. That would be much cheaper in the long run.

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Originally Posted by zeake

Your project would no longer be street legal. If it were me I'd find a competent technician to find and solve current electrical problems. That would be much cheaper in the long run.

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Agreed, but if this is just a show truck why not make it real simple with say a Painless 16 circuit harness and start from scratch

I had heard that someone makes a controller for the 4L60E that will allow you to hook it up to a Gen1 motor. All you would need is a flexplate at that point.. I'll try to find where I read that.

GM Controller #12497316 Requires installation of throttle position sensor on carburetor.

Thank You!