I am thinking about switching from fi to carberated. I know I need the intake, distributer, and carb but I was wondering if there is anything else. What do I do with the opti? Any info would help. Thanks.

 

Have to keep at least part of the opti.

 

do i have to even when im running no computer and a standard sbc distributer?

 

i think you just have to plug the hole in the timing chain cover

you might also try the hybrid section

 

Can I asky why your deciding to go from F.i to carb?

 

I had this same idea last night. Looked all over last night and today for info and couldn't find much.

While doing my research, i'll post up any good sites i might find. I would ask you to do the same.

Thanks,

 

the reason why this being done is the whole computer tuning problem. i was thinking about going carbed on my motor also. but dont know yet. me and 17withabird and another buddy have been giving it a lot of thought.

 

i'm plannin on runnin carb on my motor just because i dont want alot of the expence that comes with the fuel injection at this point, all i have is a long block that i got for real cheap off a buddy of mine and i dont have the money for the injectors and stuff that it didnt come with.

 

im not too big of a fan of the whole computer stuff so id rather just get rid of it...my opti is showing some signs at 104,000 miles. i thought since im going to have to replace it soon might as well just go with a standard sbc one.

 

YES !! Another guy swithching over to a carb

There seem to be more and more enthuists out there getting a little sick of all this high-tech F.I. crap and going old school with a carb. Don't get me wrong, fuel injection is GREAT - when it's working properly. Too bad that's easier said then done in most cases.

I'm ditching my F.I. set-up aswell and going with a 750 Demon on my 396 build-up.

I'm sure eventually I'll go back to F.I., when I have the money for a really good high end system, but for now, I wan't to try something differernt.

The main reasons for my switch is because I, (unfortunately) don't have anyone in the area that knows how to program my ECM properly. Agostino Racing is close by, but there's no way I'm gonna deal with those guys with my hard earned money. I've seen first hand the way they've screwed people over - especially with EFI tuning.

A carb will be much easier (in my opinion) to work with then F.I.

Having a clean engine compartment free from wires, sensors, harness's and big plastic black boxe's is also a bonus.

When I have my motor back together, I won't be re-installing the A/C or Heating. I've already ditched the ABS, and in all likely hood, it looks as if I'll be going with the MadMan manual rack and pionion.

When I pop the hood on my car, I want to see nothing but an engine. A nitrous sniffing carb'd 396 stroker looking right back at me.

 

Someone needs to post a list of 100% for sure parts you need. I have an idea but not 100% posative if thats everything. I know you need the following:

LT1 carb intake (Will a LT4 carb'd intake w/ LT4 heads work just as easy)??
Carb
Distributor
coil
ignition box
spark plug wires
fuel pressure regulator

Anyone add to that?

I also know you DON'T need the opti anymore, or the computer for that matter. All you need is the black (ground) cable and the large purple wire that runs from the starter to your ignition key.

I heard also that the power windows, power door locks, remote entry and all that other crap will still work beucase it doesn't run off the computer. True?

Also, manuel fan switch would still work if i'm correct but they would no longer turn on by themselfs becuase of (obviously) no computer.

EDIT: Also, does anyone know a good hood that will fit all of that? Or if not, what needs to be done as far as the hood to make everything fit.

The strut tower brace for an LT1 will also no longer fit correct?

 

Here's another to add to that list,

LT1/LT4 Front Cover Plug - It's used to cover the hole on the front cover when the distributer (opti) is removed and a rear mounted distributer is used instead.

GMPP part # 12367600 Scoggin Dickey sells them for about $50 If i remember correctly.

Oh, and you're going to need an air filter that fit's under the hood too.


As far as getting it all to fit, most of the LT1's I've seen have all been race cars that used really tall singgle plane intakes. These intakes alone, pretty much sat above the fendor line and already required the use of a cown induction. (Don't forget the carb adds another 5 or 6 inches on top of that. The car's I've seen have also had to remove the entire winshield washer assembly, and cut a huge square opening in the dash to make space for the carb.

I personally don't see why anybody would go through all that trouble unless their car was going to be a race car only and they need MAXIMUM power with a single plane.

Odds are, I'm going with the GM duel plane. I'm going to grind out about an 1" or so out of the centre section, and possibvle add a 1" spacer if space permits it. It won't be a "true" single plane, but it'll definetely be worth some addition HP.

The GMPP duel plane, I haven't seen any pictures of on an LT1 with it but because of it's low rise design, you should be able to keep your stock hood (or ram air hood) without any mods.

Since no one else seems to have that set up, I'm very curious to see how well it'll perfor. I'm still shooting for 435-450 at the wheels N/A.

I feel very confident, I should be able to meet or exceed those numbers with the GM's duel plane and the mention mods already done to it.

We'll see what happens....

 

Even with the carb and air filter it will fit under a ram air hood on a 4th gen?

 

Thanks for all the info everyone. I was wondering about the fuel lines. I remember seeing once someone who sold the ones needed for the swap. Any one know of this?

 

I don't see why not, the duel plane is only about half the height of the stock intake and a carb adds another 5-6" on top of that. A low profile air cleaner should be able to fit under the factory hood.

I'm not 100% sure about this though, so don't take my word for it. I hope I'm right 'cause I don't want to buy a cowl induction hood or loose my windshield wipers.

 

We can tune it!! no problem....there are other shops besides ARE...

 

There are?

 

Hey Dirty when are we getting together to jam?

Call me Dave.....l8tEr.....Barry

 

Don't have money for the injectors, but hav emoney for intake, distrub., carb, etc. etc. Just stick with fuel injection, better gas milelage anyways

 

ROCK ON MADSCI! Eh Heywood, lets paint that body Gold. **** it!
(Sorry for the off topic guys)