How do I convert to carb from TBI?

I wonder if it is possible to use the original distributor if I carb up?couldnt I just find the schematic and supply power where needed? Just asking--


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Take thr information given to you and run with it. The original distributer is computer controlled and it will not work without a computer.

now answer my question are we modifying a '94 Chevy? If so drop it or go to a late model site and stop wasting bandwidth on off topic ****.

 

Original distributor is computer controlled.

You need a fuel pump, intake, carb, and distributor to convert it over, plus a cam change.

The TBI in one of these is not that hard to pull as a unit and swap over, especially if there's no A/C or other stuff to contend with. Traditional, no, but reliable and not that hard to work with.

 

Not unless it is made to run without a computer. They are completely different animals.

Strip your 1994 engine down to a short block and then build it back up using earlier aka pre TBI and pre computer parts. You can buy new or scrounge them up at a boneyard or swap meet.

 

I probably don't have a tall block----agreed
If i can make a <<SWAP>> for a TH400 for my 4L80E trans---cost minimal(I hope)
Drive shaft to fit the 55 Chevy ---$125
Finding the numbers to see what I have is what I've been trying to do!
I appreciate the input you guys give.I hope all of you don't consider this as a waste of time,because most everybody has a question or need direction time to time.

 

Not sure why you guys get you traditionalist knickers in a knot. This is great info. Suppose this guy was putting the big block in a deuce coupe. Feel better now?

 

STOP! READ!!!
​

He is asking how to convert FROM efi TO a carb.

It is apparently for a '55 Chevy​

****, guys. Take a few moments & READ the ****ing posts before you answer them.

 

I asked him a legit question, and expected a legit answer which I got after I got my traditionilist knickers in a bunch. You may note that I was being ignotred prior to that and the damned questions had already been answered more than once in about as many directions as they could be without creating a new language.

I did actually make a suggestion and in the interim the site took a dump at least on my server, so let me try again.

Thank you for answering my question. I was looking for a site to decode your casting numbers, most sites that decode serial numbers want money. I will find you a good easy site to navigate before the day is over.

I am not a big OD fan at least not when it comes to late model automatics, I just don't like the feel of them. A turbo 400 is a good choice if you plan on throwing the meat to it. They are stoute, and geared accordingly you can get as good a mileage as you would with the OD. Eben in stock mild trim the 454 will pull stumps so you should be able to give it a tallish gear and still play when you want to play.

If you want to perform you can look for some earlier rectangle port heads (like from a 396 or 454) and bolt them on. It will make manifold selection easier. If yu don;t want to go balls to the walls performance and just want something that is peppy and a good dailey driver quality engine the Edelbrock Performer or the Weiand Stealth will give you good off idle to about 5K performance. They are a modern intake and if that is not a concern they are not as peaky as some of the earlier manifolds that we all think we like to use.

There is one thing that should be kept in mind when buyng a distributer and that is that the GM HEI is a smog distirbuter, if you want to perform with one you will need to modify it, by the time you invest in a good performing HEI you can buy a good distributer that needs no tweeking. If you just like the idea of having everything in one place mallory makes a real neat HEI.

If you are just building a cruiser buy a GM cam shaft or an edelbrock cam shaft. The performer is a good near stock performance cam shaft and is not a high dollar item. They have a good wide power band and will work well with either intake that I mentioned.

For getting down the road with little or no major mods the 454 is a good choice. Loosing the TBI is really not that big a deal and there is no need to make it more than it is.

 

My point is I think his question was legit even on this site. For all I care he could be putting this big block in a Crown Vic. The information on the problems converting a TBI to a carb can be valuable to guys building more traditional rods.

 

Too much overthink got under my skin, and my question about what he was building was legit whether you think so or not. We waste a lot of time sorting out OT stuff and if someone is not going to use it on something on topic then the question can wait until someone is.

The reason I say that is that when someone is going to set one up for an on topic car it will be raised again even though it has already been discussed then we will be called the search police and not the "traditionalists".

I personally don't see why anyone would have a problem with someone wanting to keep things on the traditional side on a traditional site but what do I know.

Hey by the way while we are thinking about it how often do you put new plugs in a late model chevy?

 

Hey by the way while we are thinking about it how often do you put new plugs in a late model chevy?


Depends on the nitro % and how Rich/Lean it is.

 

Well my 2007 with a 5.3 just turned over 100k mikes. She's a virgin besides oil.
Its time to bust her cherry with some general maintenance items and some modifications and some new plugs. I have noticed a slight decline over the last few thousand miles.

So I'd say between 90-100k

Hows that for some off topic nonsense ******?

 

Well I asked them at the dealer and they said when it starts missing. The wife has about 130 on her's.

Jim and I could go back and forth all day and niether one convince the other that they are wrong. He maybe be correct in a sense in that I have been a little insensative and I may be correct in a sense that it is a traditional site and if we are discussing a late model car we are wasting our time and the boss's band width.

I was curious about the plugs though and we were already discussing computer controlled vehicles. I know that at least one fella on thre site uses an LS in one or both of his cars but he doesn't flaunt it so I suppose it is a legit question, right?

 

Benno, the plug change deal on a late model engine comes down to mileage and/or performance. When either falls off noticeably, it's time for a fresh set.

I learned a valuable lesson with the 4.7 in my Jeep. Use ONLY the plugs recommended by the manufacturer. I'm not a "factory original" guy, and don't ask me why, but it does make a difference.

To the OP, choice of manifold would come down to what kind of power you want out of the engine. If it IS a 454 (7.4L) it WON'T be a tall deck engine. IIRC, the heads were changed slightly on the 7.4 EFI engines, so you may need an application specific manifold. A standard carb electric fuel pump mounted inline should work fine.

BTW, the 700r4 is basically a turbo 350 with overdrive. I believe there was a 4L60 (not 4L60"E") that will give you overdrive without the computer. Turbo 400 would probably be the simplest cheapest solution.

 

4L60 and 4L60e yes there were both that is why the E designation for electronic. A friend has a 4L60 in an old buick. I am a little on Neanderthal side of evolution and still prefer the T400 as transmission of choice.

 

"Hey by the way while we are thinking about it how often do you put new plugs in a late model chevy?"

From what I understand, it depends on if the engine in in a late model Chevy or a Deuce coupe. I can't say on the former but on the latter I usually check then once a year and replace as needed.

 

Good response.

I'll just about bet that you are supposed to change the coil pacs on an LS when you change the plugs or at least that it will recommended.

There is a lot of silly stuff with that truck, the computer reminds you to do things and sometimes it reminds you to do things that don't need done. A light came on the other day and a text message that says "Service Airbag". The wife was a little concerned so I called the service dept at the dealer and the guy says, "Damn you got 130K on it already?" Then he told me how to clear the message or to bring it in and they would clear the message for me.

it has been a totally dependable truck and I can put the missus in it everyday and not worry if it is going to lay down on her in mid town.

 

4L60 and a 700R4 are the same thing, they just changed the name a couple years before introducing the electronic version.

 

Well there ya go.