Author Topic: 4053 Carb adjustments  (Read 522 times)

x66 714

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4053 Carb adjustments
« on: March 20, 2020, 07:54:56 PM »
In front of the choke housing where the 4053 number is located there are 2 screws that have something to do with air. Is there an adjustment for these 2 screws when this carb is used on a 302? Thank you, Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bcmiller

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Re: 4053 Carb adjustments
« Reply #1 on: March 20, 2020, 11:32:56 PM »
Usually 1.5 turns out from fully in.  I was told and shown how to do this when I was about 10 years old.

You can tune better using a vacuum gauge.

Good video here

https://www.youtube.com/watch?v=xscWLSpB5Go
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

x66 714

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Re: 4053 Carb adjustments
« Reply #2 on: March 20, 2020, 11:37:04 PM »
Thanks Bryon. The carb needed some serious work. Stuff that I couldn't do here including some re-machining.
You're not referring to the fuel mixture screws...right?..Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bcmiller

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Re: 4053 Carb adjustments
« Reply #3 on: March 20, 2020, 11:40:40 PM »
I added the video link after you posted. I wasn't trying to be sarcastic, even if it may have seemed so.  I was working on cars at a very early age. 
« Last Edit: March 21, 2020, 02:07:21 AM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

x66 714

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Re: 4053 Carb adjustments
« Reply #4 on: March 20, 2020, 11:46:02 PM »
I watched the video. That carb doesn't have those screws...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bcmiller

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Re: 4053 Carb adjustments
« Reply #5 on: March 20, 2020, 11:49:08 PM »
Post a pic of the area you are talking about, please.
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

x66 714

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Re: 4053 Carb adjustments
« Reply #6 on: March 20, 2020, 11:49:20 PM »
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bertfam

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Re: 4053 Carb adjustments
« Reply #7 on: March 21, 2020, 12:31:48 AM »
If you're referring to this (see below), I believe those are machining plugs, not screws.

Ed
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x66 714

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Re: 4053 Carb adjustments
« Reply #8 on: March 21, 2020, 01:32:10 AM »
 There are screws under those plugs. They appear to be some of the problems according to the carb builder....Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bcmiller

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Re: 4053 Carb adjustments
« Reply #9 on: March 21, 2020, 01:53:17 AM »
Sorry for the mix-up.  I thought you were talking about the idle mixture screws. 

I am not aware of what those screws do, if anything. The holes above the screws are normally filled with junk.  A lot of carbs don't even have the holes machined into the housing.
« Last Edit: March 21, 2020, 02:27:12 AM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

Jerry@CHP

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Re: 4053 Carb adjustments
« Reply #10 on: March 21, 2020, 02:02:55 AM »
Those are the bleeder screws and they are set by Holley when the carbs are built.  You should never have to go in there.  I don't have to fool with these on my Stock Eliminator '67 Z28 race car either.  If someone monkeyed with them, they may have to set and recalibrated.  Have you checked everything else out on the carb?  Warpage, correct jetting, dirt in the carb, etc. 

Jerry

x66 714

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Re: 4053 Carb adjustments
« Reply #11 on: March 21, 2020, 02:12:14 AM »
Thanks Jerry...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bertfam

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Re: 4053 Carb adjustments
« Reply #12 on: March 21, 2020, 02:12:52 AM »
Thanks Jerry!

Ed
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firstgenaddict

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Re: 4053 Carb adjustments
« Reply #13 on: March 31, 2020, 11:07:18 PM »
Typically there is a little white lithium grease smeared in the hole...
Here is the original carb from my old Z and then after Eric at Vintage Musclecar restored it.



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cook_dw

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Re: 4053 Carb adjustments
« Reply #14 on: April 01, 2020, 10:30:11 AM »
Eric does fantastic work.  I just finished rebuilding an original 3837 for the 67 Chevelle I'm doing.  Was able to keep the original finish to match the car.
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