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Certified Bwaloligisit
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Discussion Starter #1
So lets get all techy here in the clubhouse and help me grasp something.


theres a nice 383 stroker thats going for cheap near me that Id like to get and toss into my truck to replace the tired and gutless 350. Issue being is The truck is OBD1 computer running a TBI. The 383 is carb'd and does without all that computer nonsense. now I know many of you know jack **** about the chevy trucks, but heres my question.

putting a 383 in would mean my computer will be useless. I would need to get a MSD ignition box and a tuner to set that up right?

fuel system on the stock motor is a return style and electric (I believe) a carb is returnless and runs at a different pressure. Whats the best way to make this switch?

If I do with out the computer, will the transmission still be able to shift? I honestly have no idea how that works.

Also will I still have a working gauge cluster and what not. The cluster is all mechanical, but still has a circuit board and all that ****.


So spread your knowledge! even if you dont know about this situation, at least share your thoughts.
 

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Certified Bwaloligisit
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Discussion Starter #4

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Powered by LSx tears
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21,466 Posts
So lets get all techy here in the clubhouse and help me grasp something.


theres a nice 383 stroker thats going for cheap near me that Id like to get and toss into my truck to replace the tired and gutless 350. Issue being is The truck is OBD1 computer running a TBI. The 383 is carb'd and does without all that computer nonsense. now I know many of you know jack **** about the chevy trucks, but heres my question.

putting a 383 in would mean my computer will be useless. I would need to get a MSD ignition box and a tuner to set that up right?

Shouldn't need any kind of tuner. Just a 6al would work, depending on what distributor is in the 383. A tuner wouldn't even do anything. Where would you plug it in? Lol


fuel system on the stock motor is a return style and electric (I believe) a carb is returnless and runs at a different pressure. Whats the best way to make this switch?

You can run a carb with or without a return. A Holley carb is going to want about 7 psi.


If I do with out the computer, will the transmission still be able to shift? I honestly have no idea how that works.

What trans? TH400 will work no problem. 4l60e will need a control module.

Also will I still have a working gauge cluster and what not. The cluster is all mechanical, but still has a circuit board and all that ****.

If they're truly mechanical, you should be able to plug them in and they'll work.



So spread your knowledge! even if you dont know about this situation, at least share your thoughts.
Chevys are gay
 

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Certified Bwaloligisit
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Discussion Starter #6
by tuner I was saying if I had an MSD ignition and control box and stuff. Idk Im clueless on that as you can tell haha.


and from what Im reading in that thread posted, a return style is needed to cool the pump, but at least theres a part that solves that issue when running a carb. so that issue is checked.


My trans is a 700r4 (glorified turbo 400). I havent looked fully in depth to it but Im pretty sure it was the first of the computer controlled trans to go into the chevy trucks.


and yes. chevy's are gay. But I love my truck and theres no stopping that.
 

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Rent Asunder!
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For the fuel system, you can use a fuel pressure regulator to drop the EFI fuel pump's 40+psi down to just 7psi for the carb and return the rest back to the tank. I'd upsize the return fuel line to at least the same size as the feed line, if it isn't already, to avoid any fuel back pressure issues.

The 4L60E (the "E" dictates "electronic") would require a computer to tell it when to shift. You can buy stand alone control modules to serve this purpose but they are stupid expensive. By expensive I mean you could swap out for a TH400 for cheaper.

EDIT: Just read that you have a 700r4. This depends on what year you have as the later years of them went electronic. The earlier years were non-electronic, mechanically shifted but also weren't as strong.
 

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Certified Bwaloligisit
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Discussion Starter #8
I'm not sure about the year of the Trans it's self but the truck is an 88. So I'd assume the Trans is the same. Also the Trans has been rebuilt and has a shift kit in it. I'll have to find some numbers and look up I'd the trans is electronic or not
 

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impecunious
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7,412 Posts
by tuner I was saying if I had an MSD ignition and control box and stuff. Idk Im clueless on that as you can tell haha.


and from what Im reading in that thread posted, a return style is needed to cool the pump, but at least theres a part that solves that issue when running a carb. so that issue is checked.


My trans is a 700r4 (glorified turbo 400). I havent looked fully in depth to it but Im pretty sure it was the first of the computer controlled trans to go into the chevy trucks.


and yes. chevy's are gay. But I love my truck and theres no stopping that.
The msd boxes are only used on motors that don't have a distributor, like if you decided to take a modular motor and carb it, or if you took a Gen III/IV Chevy and carbed it. A 383 should have a dizzy, no need for the expensive msd box
 

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Powered by LSx tears
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by tuner I was saying if I had an MSD ignition and control box and stuff. Idk Im clueless on that as you can tell haha.


and from what Im reading in that thread posted, a return style is needed to cool the pump, but at least theres a part that solves that issue when running a carb. so that issue is checked.


My trans is a 700r4 (glorified turbo 400). I havent looked fully in depth to it but Im pretty sure it was the first of the computer controlled trans to go into the chevy trucks.


and yes. chevy's are gay. But I love my truck and theres no stopping that.

You don't HAVE to run a return with one. Mine is a deadhead......no return. As mentioned earlier, it just depends on which 700r4 you have.
The msd boxes are only used on motors that don't have a distributor, like if you decided to take a modular motor and carb it, or if you took a Gen III/IV Chevy and carbed it. A 383 should have a dizzy, no need for the expensive msd box
Say what? MSD boxes are most definitely used with a distributor.
 

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impecunious
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You don't HAVE to run a return with one. Mine is a deadhead......no return. As mentioned earlier, it just depends on which 700r4 you have.

Say what? MSD boxes are most definitely used with a distributor.
He mentioned tuning it with a computer, so the msd boxes I figure he was talking about was something like a msd mod 6, where it's basically a standalone spark controller that you can plug a laptop into and adjust timing.
 

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Certified Bwaloligisit
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Discussion Starter #16
I did mention a computer but that was in reference to the factory computer on the truck
 

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impecunious
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He never mentioned a computer??? He mentioned a tuner, but he most definitely doesn't need one of those either. However, he does still have to have a box. A 6al would work fine for what he's doing.
Well when he said tuner I, for whatever reason, thought he meant tuning software. And I wasn't thinking about the traditional msd box for distributors, so sorry for the confusion.
 

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Certified Bwaloligisit
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Discussion Starter #19


there she is. $1500

bored .030 over with 3.75 stroke
speed pro hypereutectic pistons with new rings
.488/.510 lift cam
new chrome oil pan,new chrome timing chain cover
new melling oil pump
new 1.5 ratio roller rockers
arp main cap studs
aluminum edelbrock intake with edelbrock 750cfm carb
10.0:1 compression.

---------- Post added at 11:45 PM ---------- Previous post was at 10:19 PM ----------

also it looks like the 700r4 does not rely on the computer in any way. the only thing electrical with the trans is the Overdrive lockup on the converter. So with the carb, I will lose the connection for this to function which means that the engine will rev about 200 revs higher in final overdrive. They make a kit though that can adapt that to the carb to regain that function. As of right not its not a huge deal to me as fuel mileage is not something I worry about. if anything, I might lose a mile per gallon from what I read.
 

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Certified Bwaloligisit
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28,084 Posts
Discussion Starter #20
anyone know of a person I can talk to that is knowledgeable in the chevy motors electrical wise? I have questions regarding what distributor to get, whether or not a MSD 6AL is needed for it, and if my factory computer is needed. I ask this because even though I dont care for the sensors and stuff, I know the factory engine has plugs for things like a knock sensor and various other stuff that Im sure a block from 76 will not have. So im wondering what all will happen when leaving that stuff out with the stock computer. I also want to confirm if the stock gauge cluster will work or if I need to build my own set and wire those in separate.

I just have many questions for all this old school stuff. Dont hate me as I am learning on a mustang forum lol
 
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