Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old Mar 18, 2021 | 10:09 PM
  #1  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Distributors

I have a 1986 Z28 with a 305. I am swapping my TPI to carburetor. Will I need new distributor? If already posted lead me in right direction. Newbie here
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Old Mar 18, 2021 | 10:28 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Distributors

Why ? Hei vacuum advance dime a dozen
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Old Mar 18, 2021 | 10:31 PM
  #3  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

I guess what I’m asking is if I will need a new one that is not ECU controlled? Is the stock one controlled by the ecu?
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Old Mar 18, 2021 | 10:32 PM
  #4  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

Just don’t know if the stock one will work or if I need hei vacuum advance?
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Old Mar 18, 2021 | 10:33 PM
  #5  
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Distributors

Yes ecm controlled by why switch to Dinosaur technology?
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Old Mar 18, 2021 | 10:35 PM
  #6  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

Having a ton of trouble with TPI and I have almost everything to just make it carbureted.
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Old Mar 18, 2021 | 10:37 PM
  #7  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

My start up injector is trash. Can’t find one and some other idle issues.
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Old Mar 18, 2021 | 10:45 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Distributors

Can easily diagnose and even upgrade the tune.
Costs a fair amount to go backwards with technology.
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Old Mar 18, 2021 | 10:49 PM
  #9  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

Just not a big fan of the TPI and I pretty much have everything to do it with the exception of a distributor. Just my preference I guess.

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Old Mar 18, 2021 | 10:51 PM
  #10  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

I truly respect your opinion. I just like the simple stuff that I know a lot more about for now. My wife just wants to drive it this summer. Thinking of late model swap in the future. Who knows???

Last edited by Chip1977; Mar 18, 2021 at 10:54 PM.
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Old Mar 19, 2021 | 02:28 AM
  #11  
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Car: '86 Iroc Z & '91 RS
Engine: 305 TPI & 305 Qjet - Future LC9
Transmission: 700R4
Axle/Gears: 3.23
Re: Distributors

Originally Posted by Chip1977
My start up injector is trash. Can’t find one and some other idle issues.
Some of the early '86 proms were buggy anyways, do a search on them.. MIne had one.. I updated to the '89 tune that doesn't require that 9th injector, it raised my shift points if your auto, lowered the fan temps, disabled vats, ect. ect.. My '86 runs like it should after that simple swap, and unplug of that 9th injector.. Tuned Performance should be able to set you up with the right chip and tune.. much easier than a complete swap in my opinion.. plug and play.. and yes you need to change the distributor to swap to carb..

edit: your going to need to find away to lock up the trans without the ecu as well.. control radiator fan, fuel pressure to high from in tank pump for carb... ect. ect.. ect..

Last edited by Camaro86IrocZ; Mar 19, 2021 at 02:38 AM.
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Old Mar 19, 2021 | 12:16 PM
  #12  
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Distributors

Originally Posted by Chip1977
I truly respect your opinion. I just like the simple stuff that I know a lot more about for now. My wife just wants to drive it this summer. Thinking of late model swap in the future. Who knows???
If fixing TPI is too difficult I would stay away from hard things like engine swaps but as far as HEI this one is cheap and has enough reviews that I would consider it

Amazon Amazon


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Old Mar 19, 2021 | 07:23 PM
  #13  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

I believe I now have pretty much everything.

New intake
intake bolt kit
new Holley 600cfm carburetor
carburetor stud kit
air cleaner
700r4 bracket for cables that attaches to carb
fuel regulator w/ bypass
new fuel return line
hei vacuum mechanical distributor
transmission lock up kit
fuel filter

also got 2 electric fans and wiring kit
aluminum radiator
all new suspension bushings
new struts and shocks
new plugs and wires
Mid-length headers
new valve covers and gaskets
new timing chain and front main seal
new belts
new exhaust and muffler.
I’m sure I forgetting a few things.

plan to build a 383 this summer and a lot of these parts will also work in that application

thanks for the reply’s


Last edited by Chip1977; Mar 19, 2021 at 07:27 PM.
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Old Mar 19, 2021 | 08:03 PM
  #14  
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From: Spring Hill, Fl.
Car: 87 iroc-z
Engine: 454
Transmission: th350
Axle/Gears: 3.73
Re: Distributors

I also got rid of the TPI and went carb/HEI. So much simpler IMO. I know there are people who are great with them but i'm not one. Once start changing cams, cubic inches, power adder, etc, the TPI becomes difficult to tune to me. But i am glad there are still people who know how to work, service and upgrade them. I'd hit up TunedPerformance in a heartbeat for TPI stuff. Sounds like you got a lot of work ahead of you, LOL. Have fun wrenching and post some progress pics
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Old Mar 19, 2021 | 08:20 PM
  #15  
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Distributors

While I personally can't understand why anyone would want to downgrade their car I wish you both the best of luck
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Old Mar 19, 2021 | 08:46 PM
  #16  
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From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Distributors

One item you forgot - throttle valve geometry correction adapter for the carb.

Last edited by NoEmissions84TA; Mar 19, 2021 at 10:15 PM.
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Old Mar 19, 2021 | 09:48 PM
  #17  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

This what you are referring to?
https://www.jegs.com/i/JEGS/555/157300/10002/-1?gclid=Cj0KCQjwl9GCBhDvARIsAFunhsmXHThfnosHAWse1h_OwRVi7HNZ3o4E8QVtX6fZgf8BeHWNIzFuIBcaAjd5EALw_wcB



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Old Mar 19, 2021 | 10:10 PM
  #18  
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From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Distributors

Yes, exactly.


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Old Mar 19, 2021 | 11:01 PM
  #19  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors








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Old Mar 19, 2021 | 11:03 PM
  #20  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

Exhaust
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Old Mar 23, 2021 | 02:45 PM
  #21  
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From: waterloo ontario
Car: 1986 trans am
Engine: 305/350
Transmission: 5 speed
Axle/Gears: 3.27
Re: Distributors

nice camaro,best of luck whatever you choose...carbed small blocks suck gas like theres an unlimited amount of dead dinosaur juice available,i miss my 5.7 TPI iroc.....reasonably quick and sipped fuel in comparison

Last edited by 1986BANDIT; Mar 23, 2021 at 02:51 PM.
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Old Mar 23, 2021 | 03:04 PM
  #22  
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Distributors

Originally Posted by 1986BANDIT
nice camaro,best of luck whatever you choose...carbed small blocks suck gas like theres an unlimited amount of dead dinosaur juice available,i miss my 5.7 TPI iroc.....reasonably quick and sipped fuel in comparison
Switching from carb to EFI is becoming he best thing I ever did on my car
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Old Mar 23, 2021 | 08:00 PM
  #23  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

Originally Posted by 1986BANDIT
nice camaro,best of luck whatever you choose...carbed small blocks suck gas like theres an unlimited amount of dead dinosaur juice available,i miss my 5.7 TPI iroc.....reasonably quick and sipped fuel in comparison
thank you. The wife is ready to drive it. Paint comes next. Her father owns a paint and body shop. He gonna surprise her.
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Old Mar 23, 2021 | 08:01 PM
  #24  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors

Originally Posted by NoEmissions84TA
Yes, exactly.

thank you. Already ordered.
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Old Mar 23, 2021 | 08:03 PM
  #25  
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From: North Carolina
Car: 1986 Z28
Engine: 305
Transmission: 700r4
Re: Distributors


My living room starting to look like a parts house.
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Old Mar 23, 2021 | 08:06 PM
  #26  
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From: waterloo ontario
Car: 1986 trans am
Engine: 305/350
Transmission: 5 speed
Axle/Gears: 3.27
Re: Distributors

i always have parts around,not neat and in boxes though....wife hates it
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