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1986 z28

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Old Apr 4, 2008 | 10:15 PM
  #1  
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1986 z28

I want to replace the quadrajet on my car with a holley. Does anyone know of a direct replacement so I can use the stock intake for now? Will get a new intake later for the new motor. The carb on there is a piece of junk. I'm taking off all the emission crap to. In Illinois anything older than 1995 no more emission tests. Also will i still need the computer if I rip all that crap out?

Last edited by Red95; Apr 4, 2008 at 10:19 PM.
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Old Apr 4, 2008 | 10:55 PM
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From: Bloomingdale, NJ
Car: 1985 Z28
Engine: 350
Transmission: T-5 5 Spd
Axle/Gears: Built 10bolt w/3.73s
Re: 1986 z28

What are you trying to acomplish by removing this stuff? It won't gain you any ponies and will just cause you $$$. I have the CC Qjet system on my car and it roars, check the sig, even planning a blower it'll sit on top of.

Whats the problem, maybe we can fix it?
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Old Apr 5, 2008 | 06:41 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by Red95
The carb on there is a piece of junk. I'm taking off all the emission crap to.
Can you back that up with data?

I agree with Trumps. Same thing here, pretty decent power, driveability, and economy. None would be better with anything else, and at least two would be worse.

The only "direct" aftermarket replacement (and it's only "direct" in that it will bolt to a stock manifold) is a Holley 6210 DP. If you remove the computer controlled carb, you need to replace the distributor as well; and if you have an automatic transmission, provide some means of locking up the torque converter.

Last edited by five7kid; Apr 5, 2008 at 07:22 PM.
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Old Apr 5, 2008 | 08:53 PM
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Re: 1986 z28

The problem is it bogs off the line but when you are driving and floor it it fines. Check the acc. pump like everyone said it get to good squirts. So I dont know what wrong.
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Old Apr 5, 2008 | 09:19 PM
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dirtywhiteZ28's Avatar
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From: Houston, Texas
Car: 84' Z28-White/T-Tops
Engine: H code LG4 305
Transmission: TH700R4
Axle/Gears: Stock 3.23
Re: 1986 z28

You need to learn how to two foot the brake and gas. Bring up the RPM'S to about 1200 and floor it when you release the brake, you'll never bog off the line again.
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Old Apr 6, 2008 | 12:16 AM
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From: Bloomingdale, NJ
Car: 1985 Z28
Engine: 350
Transmission: T-5 5 Spd
Axle/Gears: Built 10bolt w/3.73s
Re: 1986 z28

I had a similar problem. It turned out to be a vacuum leak caused by my intake gaskets. Have you checked all the vacuum lines? I bought the assorted vacuum line caps from the auto parts store and capped off everything but the brake booster, pcv, and MAP sensor, just to check things out.

Last edited by trumps2000; Apr 6, 2008 at 10:27 PM.
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Old Apr 6, 2008 | 01:06 AM
  #7  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by Red95
I dont know what wrong.
It will be a lot cheaper, both short- and long-term, to find out what is wrong and fix it, rather than replace the carburetor and distributor, and rig up TCC lock-up.
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Old Apr 6, 2008 | 10:05 PM
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Re: 1986 z28

I'm going to be replaceing the motor with a 350 Do you guys think I should just leave all the emissions stuff on there? From what I here most of you say leave it on. I have already taken the belt off the air pump didn't seem to make a difference at all.
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Old Apr 6, 2008 | 10:25 PM
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From: Bloomingdale, NJ
Car: 1985 Z28
Engine: 350
Transmission: T-5 5 Spd
Axle/Gears: Built 10bolt w/3.73s
Re: 1986 z28

I've got a midly cammed 350 and retained the CCQjet, CAT, heated air filter assembly, and EVAP systems. In my opinion these systems make the car more driveable. It warms up faster, runs cleaner, and saves MPGs, without stealing much if any HP or adding any weight really.

The only one I ditched was the exhaust valve on the passenger that closed and forced exhaust through the intake. I thought it might be restrictive and I don't care about cold weather.

I plan on reinstalling the AIR pump and maybe even the EGR.
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Old Apr 7, 2008 | 03:13 PM
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From: US
Car: 86 iroc
Engine: 305
Re: 1986 z28

if you plan to replace the motor then change the cc carb set up at that point if you still want.for now have it rebuilt and it will work great.Had mine done 4 years ago,not a problem since.Infact once my 305 has had enough I will stick with this setup on a 350 with little tuning.they work great when tuned right.
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Old Apr 7, 2008 | 03:37 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by zee28
if you plan to replace the motor then change the cc carb set up at that point if you still want.
Why?????
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Old Apr 9, 2008 | 01:04 AM
  #12  
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Re: 1986 z28

Originally Posted by Red95
In Illinois anything older than 1995 no more emission tests.
I hate Cali...... anything older then 78 here lol!
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Old Apr 9, 2008 | 10:54 AM
  #13  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
1978? Last I heard it was 1975. But, still doesn't reach to 3rd gens. It's 25 years old in Colorado (but you have to get 5 year collector plates to be exempt from emissions inspection/testing).

The computer carb system is quite capable of handling a mildly built 350. As in the sig above.

If you have a bog off-idle and your accelerator pump is squirting, first make sure it is squirting immediately upon throttle movement. Then check your timing - zero degrees is the factory base setting, try increasing it to 6 BTDC and see if that helps. Make sure you disconnect the flat 4-wire connector going from the distributor base to the firewall harness before you check the timing.
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Old Apr 12, 2008 | 06:24 PM
  #14  
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From: US
Car: 86 iroc
Engine: 305
Re: 1986 z28

why?.Not seen to many cc carb camaro/firebird owners who keep the set up when they re power.have any pics?Fact is if you have this set up and it runs great then fine.If you need to replace the motor and dont need to pass this in inspection then its much easier to leave all this stuff off and surely less to deal with and much more room.thats why
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Old Apr 12, 2008 | 07:53 PM
  #15  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Pics of what?
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