GoldOne1

What type of headers? any special year I should use?, obviously i cant order a 91 camaro header the bolt hole will still be missing on one of the vortec heads??

85T/A350

I ordered headers specifically for a 1987 Trans Am and they work just fine on my Vortec motor. Heddman 68460 longtubes.

five7kid

iTrader: (14)

Your best choice for headers is the '86-'90 TPI single-cat application.

To the best of my knowledge, no aftermarket header uses the "7th" exhaust manifold bolt hole like the stock manifolds use (no reason to), so they fit 6-bolt heads just fine.

lunaticinaZ

it's a 91 in his sig. he wont need the esc module. 91 is SD there is not a esc module like the older cars.
thats if he stays with the original ecm

GoldOne1

Thanks for the info UPDATE.;; I did the 350 knock sensor and the 350 esc module... you mention 8746 ecm from a caprice however my research shows the 8746 ecm is what I have stock on a 305 setup am I missing something? also I have been told I can use a 454 tbi what do you think? I have a local guy who will sell me one for $100, also looking to put headers on whats the best bang for the buck.. keep in mind i removed all the smog garbage...

Thanks again Im almost there..

Heslekrants

My son's Vortec project was low buck so instead of going with custom program chip we bought a ECM from a Caprice Cop car (with the same 8746 ECM as his Camaro) which has a performance programed chip in it.

I think the best bang for the buck on headers with ground clearance in mind is Hooker Headers 2460HKR - Hooker Competition Headers
http://www.summitracing.com/parts/HOK-2460HKR/

The 454 TBI can be a good upgrade but it's not a simple bolt on and some require much higher fuel pressure to operate. See chart below.

Zach/90\irocZ

iTrader: (6)

Wow I like this setup you running how much HP and torque you running with this set up

Zach/90\irocZ

iTrader: (6)

Unfortunately I had to put a lo5 in my rs cause its my daily driver and my 305 engine blew and didn't have time to research and look for a good engine to swap
But I'm going to swap a vortec next since I have time research and nit worry about riding bike to work

I already started searching for engine so maybe in a month or two another project begins as another one ends

Zach/90\irocZ

iTrader: (6)

Also what other parts would put your engine setup into 350 - 400hp range next year I want.to be in the 12s

Heslekrants

We were at the 300hp level & running mid 13s but more importantly this was a very torquey motor in the Camaro. Getting traction was a big problem.

To get to 400hp you need to mod the heads to accept a bigger cam, install bigger cam, bigger injects/up the fuel pressure & replace the pistons for higher compression or just run some nitrous. The 1st thing you need to do is decide what kind of driveability you want. Running a radical high hp car as a daily driver gets on you after awhile. Been there done that.

Another option is to build a 383 stroker. I have a Vortec 383 stroker running a .534 cam in my 99 Suburban that's pushing well over 400hp and is very streetable.


Let another option if you have some fab skill is to install an LS motor. I almost did that with my 99 Suburban & now I wish I would of. Gotta love those LS motors.

Zach/90\irocZ

iTrader: (6)

Yea you got a point I was looking for at the fly wheel HP since I got a auto so about 15 % lose due to drivetrain but 300 is a good level I only drive 2 min to work and I have a Prius aka not so fun to drive I have a L05 in my car now was thinking getting vortec heads and make it a roller I heard some people putting l31 heads on tbi 350 but I like you setup tho and it runs 13s with 300hp sounds real easy to do

Zach/90\irocZ

iTrader: (6)

I want to get ls motor but way to expensive in California

Badrs2810

I have a 91 RS as well, do I not need an esc module? Nor an ECM? That would save me time and money if so. I'm picking up my motor, intake, headers, and injectors in a month, planning on a 3 day swap time.

lunaticinaZ

A 91 don't have a ESC module. the 91-92 are speed density cars, the Spark control is not run off a esc module. the spark contorl is run my the ecm and dizzy. If you keep your original ecm then you will have no need for a esc. All you will need to do is make sure you get a 350 knock sensor(they are year spacific) and you will be fine.
The only cars that have or need a ESC module are the 90 and older MAF cars.

Badrs2810

They are year specific, so is it year specific to the year motor, or to the year of the car it's going into?

lunaticinaZ

year of the car it's going in to, but also engine size. ex. you would get a knock sensor for a 91 rs camaro with a 350(if thats the engine your going with)

Badrs2810

Ok that's simple enough. Wow, this swap is only goon to cost me 130$ for the long block 350 vortec via pick-n-pull, 144$ intake, 10$ for 350 injectors, 180$ for Hedman elite headers via craigslist, and the cost of a 350 knock sensor for a 91 camaro. And maybe the cost of flat top pistons... Don't know yet

Badrs2810

Just one issue, when I type in "91 camaro 350 knock sensor", I get nothing. Does anyone know where I can find this, and what's the part number?

Badrs2810

Would this be what im looking for?

http://item.mobileweb.ebay.com/viewi...id=37250185787

zenish

so a 1991 305 tbi engine is different than my 1989 305 tbi engine?

Badrs2810

I think he's saying the motors are the same.... The way they are controlled, is different.... Example... 93 lt1 is speed density and 94-97 are not speed density. Could be wrong, I have had a 90,91, and 92... All the motors look the same, even the motor in my 83 looked the same, other than the fact is was a 4 brrl.

guitarguy92b

i thought i had read in one of these swap threads that u have to do something to the trans to make it shift when u swap from a tbi to carbed. havent seen it since and cant remember where i seen it. im plannin on a carbed 350 swap here very soon i just need to know for sure before i do it. and then i gotta read up on removing the ECM stuff like what of the wiring harness i need to leave, any help with the trans thing?

gregl316

iTrader: (1)

Great thread. I am doing the same swap. Mine is a 91 RS too. I have an auto. I have a flywheel on the Vortec do I need a specific starter? You said you went with 1.6 roller rockers. I talk to someone and they said not to. My motor is a 1999, 330 horse flat tappet cam crate motor and it's ratio is 1.51. Can I do it? Did the stock pump put out 18#s pressure you needed? I was also told to swap pumps with a TPI pump. So does mine have a ESC module? I found the pair at Amazon for 82 bucks free shipping. I come up with 10456288 for a 350 knock sensor. You say it is year specific. Is that year of the motor or car? As far as headers did you use Summit or Edelbrock? I did not find a Y for the Summit headers. I was going to go with Hookers. I am going to delete the smog equipment so all that stuff is cheaper. All I can find for smog headers are Hooker and Flowtech. I hope someone reads this and answers me. I am starting to get overwhelmed with information.

Heslekrants

I used Edelbrock headers #350-68723 at Jegs.com.


Stock Vortec 5.7L heads are only good for ~.480 lift so it depends on your current cam lift to if you can upgrade to 1.6 rockers. The 2 stock 5.7L Vortecs that I installed 1.6 rockers were the best bang for the buck improvement I made.


The stock fuel pump on the 90 Camaro along with an adjustable regulator fed the 5.7L Vortec enough to run mid 13s at the track.


The starter needs to match the flywheel that you use. Keep in mind the Vortec uses a weighted flywheel.


The knock sensor needs to be match to the year of the car.


My son sold his Camaro some time ago but it was a fun car with the 5.7L Vortec in it.

zenish

the shift is controlled by the tv cable and the governer in the trans.if you switch to carb you still have to use the tv cable.you can buy kits for that.

gregl316

iTrader: (1)

I have a 99 Vortec 330 hp 350 to go in, It is a flat tappet cam should I still look for 1.6;1 roller rockers? Rite now their 1.51;1. Won't that screw up my cam profile? Are they really worth it? Can I get away with eBay rollers? They are SS and full roller or the others are aluminum. They are both under $200. Should I spend the money for name brand like Comp.
Can I get away with a TB from a 454? Or should I just get a ported 350 TB w/350 injectors?These are
So are these the rite ones for a 91 RS? I found them on Amozon for 85 bucks with free shipping.
* 350 ESC module - GM 16128261
* 350 knock sensor - GM 10456288

berlinetta1983

Ok i got a 355 with comp magnum 270h cam with the dual gap hi rise intake and a 1406 eldobrock 600 cfm carb soon to be a q-jet and vortec heads but still got stock heads right now was just curious bout the tbi set up do u think a carb to a tbi swap would b a good idea and wat kind of mpg does it get

Zach/90\irocZ

iTrader: (6)

depends on how good you can tune your carb really
any efi system is going to be way better driveability wise
what power goal you want and what tbi setup your looking at 454 305 or holley tbi setup
but you will have better diveability overall with like cold starting etc etc and you will gain mpg maybe 1-3mpg maybe more depending on driving style lol so really its up to you tune your carb by some one or yourself if you know how to do it right or go efi

AJHECK95

My car has the 305 tbi, so if i did this same build i can use my original wiring harness and throttle body but just swap to 350 injectors, 350 computer, and the knock sensor?

89irocz350carb

how did you do the computer system since you put a TBI on it will the factory 305 computer system work for it? Im looking into doing this swap in the next month or so my dad wants to put a TBI on it but I wanted to go the easy way out and put a carb on it. can some one help me here??