suicidal racing

iTrader: (14)

This is to help all thoughs out who are wanting to swap over from fuel injection to Carb and for thoughs who are sick of doing the opti 5 nuckle shuffle!


PART 1..ENGINE INFO AND PARTS NEEDED

These are the main engine parts you will need to use to convert over to the carb setup

1. G.m lt1 dual plane intake or you can run some other gen 1 intake.
http://www.summitracing.com/parts/NAL-24502592/

2. G.m vented opti timeing cover because you will need to use the part below and it only fits vented covers
http://paceperformance.com/index.asp...&ProdID=130501

3. You will need this indicater so you can read your timing.
http://www.summitracing.com/parts/NAL-12367600/

Edit #2 an 3 are optional now,after more research ive found out that if you just weld up your water pump drive hole if your running a electric pump and the opti hole you then can just run a cheap gen 1 sbc timing pointer they run about 8$ at autozone.i know for sure they work on the non vented covers..this option right here will save you a nice chunk of change.heres a pic of a spectra 4237 on a motor http://i97.photobucket.com/albums/l2...8/57af2f6f.jpg

4. Now you will have to change your stock balancer to a pinned style with timing marks so you can set your timing
http://www.summitracing.com/parts/PFS-80030/

sfi aproved one
http://www.summitracing.com/parts/PFS-90030/






PART 2..IGNITION SYSTEM INFO AND PARTS NEEDED

These are the routes you can go for your ignition system,their is a couple ways so i will list them all for you guys and girls so you can choose what suits your needs best.


HEI STYLE SETUPS

1. Summit hei distributer
http://www.summitracing.com/parts/SUM-850001R/
Flame thrower module so you have better spark output in the upper rpms
http://www.summitracing.com/parts/PNX-D2000/

2. Msd hei distributer,you dont need the module posted above because it has enough spark output.
http://www.summitracing.com/parts/MSD-8362/

3. Heres the rpm module that you would need on either distr msd or summit to have a rpm rev limter or you can just buy the kit below as #4..if you get this you dont need the pertronix flame thrower one posted under the summit distributer and in all honesty if your going this route just buy the summit distributer
http://www.summitracing.com/parts/MSD-83645/

4. Here is a complete msd hei setup/kit you can use along with the summit distributer that gives you a 6al box
http://www.summitracing.com/parts/MSD-8500/


POINTS STYLE SYSTEM

1. This kit is what you can go with if you do not want to go the hei route an would like to use the older points style system for ignition
http://www.jegs.com/i/MSD+Ignition/121/6421K/10002/-1

Plug wires this is up to you for what you would like to use such as either custom kits or reg kits.You will be using gen 1 style sbc kits though now.

Final part will be a distributer hold down bracket for either route you use for ignition system
http://www.summitracing.com/parts/SUM-400500/







PART 3. FUEL SYSTEM INFO AN PARTS NEEDED

You will need to change your fuel pump maybe,I say this because some get away with there pump they already have and some dont.Im not going to list fuel pumps in here because thats up to you and i do not know your hp output.Im also not going to list fuel lines because thats up to you.

Now depending on your deal,If you use the stock pump you will be running a return style system an i recommend running your return line 1 size larger then your inlet system do to the fi style pumps being high pressure pumps.

If you swap the pump to a non high pressure style of pump you can either run whats called a dead headed system which is a system with no return line or you can run a bypass style regulator and run a return style system.You can run say a holley blue or black with the stock tank and re do all your fuel lines if you want..I then would just take my fuel pump out my stock tank,leave the stock sending unit and put a bulk head fitting into the tank..then just run a line off that into a filter and then my fuel pump after that if i wanted to use the stock tank..i would use the stock return port an do the same if i wasnt running a dead headed system..if running a dead head make sure to cap your return line port..


1. Dead headed system reg
http://www.summitracing.com/parts/HLY-12-803/

2. bypass return reg
http://www.summitracing.com/parts/AEI-13301/

theres cheaper and more costly regs you can pick from,these are 2 ive used.


3. Now if your using the stock tank and rear lines you will need hard line fitting adapters for the fuel line running forward and your return line..you could get away with using stock but its better to swap out to the size you need and upgrade to new lines i feel.
http://www.summitracing.com/search/D...eyword=adapter

4. Fuel pressure gauge so you can set your pressure.You will need an inline adapter or you can get a carb feed line kit that has a npt fitting so you can attach your gauge.
http://www.summitracing.com/parts/AEI-15632/

Link to fittings page for this
http://www.summitracing.com/search/D...=fuel+pressure

5. Carb feed lines,heres the page so you can choose the ones you need depending the carb your using
http://www.summitracing.com/search/?...Lines%20&dds=1

6. Carb,you can go alot of routes this way but heres 2 4160 carbs you can get that will work or you can get a 4150 style double pumper and such,it all will depend on your needs

Eletronic choke
http://www.summitracing.com/parts/HLY-0-80508S/
Manual choke
http://www.summitracing.com/parts/HLY-0-3310C/

7. Carb linkage an throttle brackets will depend on your carb so heres a page
http://www.summitracing.com/search/P...+cable+bracket

If you get 1 of the carbs listed above or a 4150 this will work if your running a manual valve body trans
http://www.summitracing.com/parts/HLY-20-88/



PART 4..OTHER USEFUL INFO


1. When using a 700r4 you can remove the pc completely,if you have a 4l60e you will have to swap over to a 700r4,th350 or th400 if you want to ditch the pc.the 4l60e trans uses the info from the engine from the pc for when to shift i believe.

2. If you want to keep the 4l60e and ditch the ecu you will need something along the lines of this to run the trans(thanks somlt1 for the info)
http://www.summitracing.com/parts/TCI-377500/

3. Now just run your fan off a manual switch

4. If your water pump is a electric one you can just run it on a manual switch also.

5. For the gauges you can just get manual gauges an stuff..lights,wipers and such are not run by the ecu..

6. Your fuel pump you can wire up to either come on when you turn your ignition or you can run it also off a manual switch like the fan,water pump and such.A good saftey trick is run a oil pressure kill switch inline so if your in a wreck and your knocked out and motor is off your pump dont stay on feeding a fire or spitting fuel every where.



I beleive this covers all the info to make a full swap and to give you and idea of the cost of it.If there is any suggestions,tips or other usefull info please post it up to help others out.

Thanks

ADM

I just checked on the MSD website, it says the MSD 8362 has the 4 pin module included with it. I e-mailed them to confirm if its included or needs to be purchased separately.

Will someone make this a sticky, extremely informative write-up. Thanks suicidal racing for all the effort you put into making this thread.

EDIT: I quote from MSD's Street Fire website :-

suicidal racing

iTrader: (14)

You are right adm the msd 8362 that i have for #2 on the hei list does not need a 4 pin module like i have under the #1 which is a summit hei distributer that i say to grab a flame thrower 4pin module to use in conjunction with the summit distributer..the msd already has the high output needed for the upper rpms.


Now with that being said #3 on the list is a msd 4 pin module that needs to be used with either hei distributer no matter if it the summit one or the msd one i have posted above..THE MODULE IS AN HIGH OUTPUT ONE WITH A BUILT IN REV LIMITER THAT NITHER THE SUMMIT OR MSD DISTRIBUTERS LISTED ABOVE HAVE UNLESS YOU GO WITH #4 ON THE LIST UNDER HEI.so now if you plan on geting the rev limiter module or the kit that i have as #4 i would just get the summit distributer seeing its 40$ cheaper then the msd one listed.

Black94Z28

iTrader: (12)

Bookmarked this, why isnt his a sticky?

suicidal racing

iTrader: (14)

because carbed guys get no love..lol i dont know though on a the real level..

heres a way to wire in the fuel pressure saftety switch and electronic fuel pump an how to clean a holley fuel pump.
http://holley.com/data/Products/Tech...199R7914-3.pdf



Now lets talk trans seeing if your going to a carb your more then likely on the more hard core side and will be using a th350,th400 or glide...only the th350 will work with stock drive shafts..the 400 and glide will need custom made ones.

If you are going to run a th350 trans you will want one with a 9" tail shaft on it(these where used in 70s/80s vans and trucks)

bmr makes trans mount bracket that lets you either use the stock auto's tq arm or they make one for about 50$ cheaper that is just the trans mount with out the tq arm mount on it..If you got a after market tq arm that mounts to a cross bar then you would want that or if you had a 6spd.

Now also remember th350,400s and glides converters have 2 different bolt spacings meaning some are ment to be used on a flex plate that has 11.50 pattern or some have the other 10.75" pattern..

the stock lt1's flex plates are 153 tooth,externaly balanced 1pc rear main seal and have 10.75 pattern on them..least mine is/was(i learned this the hard way but needed a sfi plate anyways so it wasnt a big deal)

this is the plate i have now and is set up for both bolt patterns
http://www.summitracing.com/parts/QTI-RM-932/





NOW seeing your converting over and now will me running a none electonicaly controled trans an motor you will be looking at the stock wireing and going man i need to trim this up..its easier to just buy a wireing kit and rewire the whole car vs trying to go threw your harness 1 wire at a time not to mention gm was slick and some of them wires are tied into 3 or 4 different things so one bad snip and your done for..

This is the kit im using to do my car(all but my fuel level gauge is mechanical,an my windows are perm up for now)..its very simple and straight forward..you could rewire your whole car in a day really an thats the avg joe..some stuff would take longer like having all electronic gauges,getting your power windows figured out..you know.
http://www.speedwaymotors.com/Econom...ness,2352.html

heres a 20 circuit version say if you have more stuff..
http://www.speedwaymotors.com/Mr-Roa...ess,42872.html

mdacton

iTrader: (3)

Wow Is all I have to say about this. so informative I have gotten a chubby

Black94Z28

iTrader: (12)

Now heres the touchy question that I have never gotten a PROVEN answer for...at what point does the factory fuel injection become restrictive and going to a carb setup is needed?

Black94Z28

iTrader: (12)

Man, you got me wanting to do this really bad now! I can tune a carb alot easier too! You know if a throttle cable from a tbi truck will work?

what intake would be ideal for a LT1 with the 847 cam and 150 shot, single or dual plane?

suicidal racing

iTrader: (14)

im not sure i found out about the throttle cable trick from another member..

i dont know them cam specs off the top of my head..but it really comes down to you if its going to be a street/strip or strip or a strip car that sees the street..lol i know im around 11.4-1 comp,.567/.585 lift,242/248 dur @ .50 110 lobe..i have a 4500 stall for my deal and will be spraying a 210 shot so im using the intake i say below.



single planes
the victor jr 2725 i think it is a good intake
weiand team g 7530
holley strip dominator 300-25 <what im using for now.

duals
edelbrock torker is a good one an im not sure about any others i always just run a single no matter what.

throttle cable thread
https://ls1tech.com/forums/drag-raci...re-please.html

Notching the cowl and getting 1 wiper to work
https://ls1tech.com/forums/drag-raci...pers-carb.html

suicidal racing

iTrader: (14)

i just looked at them cam specs an i would run a 3600 stall,3.73 gears or higher,275 tire or 28x10 slick,750cfm carb with a single plane...if i remember right your car is stripped and your probley 3100#s with u in it..with the n2o on it would change your stall speed to probley 3800 or so..which would be right where i would want it.seeing your probley going after more of a street strip deal..if your not then run a 4500 stall in it an let the bitch get down.

Now are your stock long block..if so you could do what im doing with my motor..im using felpro shim 1094 gaskets on my deal..you have to mod the water passages some to make them work on a lt1 but there only .015 thick..thats how im getting my 11.4-1 comp with stock heads an pistons ..they wont take more then a 200 shot im told so stay on your tune ups if your wanting to spray what im going to be..

Black94Z28

iTrader: (12)

I already have a 28x10.50 Radial tire, a th350 with the super street fighter convertor (3800-4000) and will have a 4.10 gear. I plan on spraying just a 150 shot, even though the engine shows no signs of wear, it does have 132K on it. The torker is a dual plane? I have one on my GTO and its a single plane. But Ive heard the Victor Jr intake is a pretty decent one. I have a Holley 750 laying around somewhere, so Id just need to come up with the intake, distributor, and a fuel pump.

suicidal racing

iTrader: (14)

how you can use your stock tank set up with a return line..then you just use a bulk head fitting on your stock outlet side



thanks speeddensity for the pic

Phstratton

iTrader: (1)

This should be a sticky!!!!!!

GITSUM95Z

iTrader: (1)

wow, every question answered before i asked it... awesome info.

the only 2 questions that i have is, (hopefully not stupid)
1) if i do this swap, can i still run the 6spd without computer hooked up.

2) i already have the msd 6al box. im already using the msd coil. will a msd pro billet dist work and hard wire like a "gen 1" pre hei small block ign setup?

thanks for this incredible info

Nostang

iTrader: (4)

Anyone have the part number on the correct throttle cable to use for the swap?

suicidal racing

iTrader: (14)

1) i see no reason it wouldnt,i dont think the pc has anything to do with the t56 in 4th gens,i could be wrong though..i do know some when using a th400 or so just go in an flip the pc over to thinking its a stick car so no check lights show.

2)If its the coil for the lt1 setup then no it wont you need a blaster coil or along them lines,and then yes the dist just hooks up like a normal old school sbc deal..

suicidal racing

iTrader: (14)

No i dont just look for a 3rd gen throttle cable that was used tbi or carb setup,that is the cheaper way to go.then grab a 4150 or 4500 throttle bracket plate and use the 2 together..

Lt1Porsche

iTrader: (6)

Question: the balancers listed in the OP's list strickly state not for use on LT1. Is that because of the design with the timing marks? Or because they just do not fit? What balancers have been used to complete this swap? Im doing it now and need a balancer.

GITSUM95Z

iTrader: (1)

I just completed this swap using the part numbers listed above. Everything has fit perfect and the motor runs like a champ. Thanks again for the info listed above!

suicidal racing

iTrader: (14)

The professional products ones work depending on what yr motor..i have a brand new sfi one for sale..im putting a ls motor in my car now