Author Topic: 4053 DZ SPECS  (Read 3319 times)

McKenzieDave

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4053 DZ SPECS
« on: September 27, 2007, 03:44:21 PM »
I need to verify that a 4053 DZ carb is unmolested.  Does any body out there have the specs on idle feed restrictor and air bleed sizes?

jdv69z

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Re: 4053 DZ SPECS
« Reply #1 on: September 27, 2007, 06:41:33 PM »
From what I have read about Holleys carbs, modifying the air bleeds and idle restrictions is something only an expert should attempt. Otherwise the carb could be become unable to be tuned correctly. Why do you think it has been modified?

Jimmy V.
Jimmy V.

McKenzieDave

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Re: 4053 DZ SPECS
« Reply #2 on: October 01, 2007, 03:13:03 PM »
Came from a guy who ran it on an old 396 part time drag car.  From other examples of his handy work, I want to be sure.  Biggest concern is I want it for a 302 that is quite close to stock Z/28 specs, I know they worked very well, and I have it laying there just begging to be used.  Dave

Vintage Musclecar

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Re: 4053 DZ SPECS
« Reply #3 on: October 01, 2007, 04:30:33 PM »
Dave;

The primary idle air restrictors on the 4053 DZ carbs are actually left open from the factory. There are two small adjustable air bleed screws located in front of the choke tower which intersect the idle air bleed bosses that you use to adjust the idle air supply. They are normally hidden under a blob of white epoxy on either side of the choke tower, but often the epoxy has deteriorated and the slotted heads of the screws may be visible.

The idle fuel restrictors on the primary side 5583 metering block should be .036"

Hope that helps.
Eric

jdv69z

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Re: 4053 DZ SPECS
« Reply #4 on: October 01, 2007, 08:00:44 PM »
Dave, could you try installing it on the car and see if it will adjust and idle correctly? That would easier for me versus trying to figure out all specs, etc? Hoe do you even measure all those bleed holes etc. without some sophisticated equipment or gages?

Jimmy V.
Jimmy V.

McKenzieDave

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Re: 4053 DZ SPECS
« Reply #5 on: October 03, 2007, 03:09:39 PM »
Didn't want to waste the time and money on a junk carb.  I measure with a precision hand drill bit set that never gets chucked.  Very accurate through .039 then it it goes fractional, so really close is what you get.  Thanks Vintage.  Dave