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What VC vacuum is necessary

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Old Mar 13, 2007 | 09:10 AM
  #1  
Viprklr's Avatar
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
What VC vacuum is necessary

I've found that I need to go tall perimeter in the valve cover department for my engine. Unfortunately the VC's I want only have 1 hole per side. So my questions are:

Does the breather have to go to the TB or can I just cap the TB port and throw in a breather on the VC?

From what I understand, PCV is necessary. True? Can I just throw on another breather?
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Old Mar 13, 2007 | 10:45 AM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
You can use a breather in one side and keep the PCV in the other.
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Old Mar 13, 2007 | 10:55 AM
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
So for the breather side should I run it to the TB or just cap off the TB?
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Old Mar 13, 2007 | 11:31 AM
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Either a tube to the TB like the stock setup, or plug the fitting on the TB and use a breather, up to you.
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Old Mar 13, 2007 | 11:50 AM
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From: 62656
Car: 1991 S10 pickup 2700lbs
Engine: 4.3L Z TBI
Transmission: 700R4
Axle/Gears: 3.08 7.625"
you need to pull gasesand fumes and such out of the crankcase either through the block or through a VC or wherever possible, the VC has been the place GM has chosen to have it located and has been connected to a vacuum source since 1968

before then it was a road draft tube out the rear of the block

you will need a filtered return to replace the air sucked out of the crankcase due to the vacuum source sucking it out through the PCV

and again the VC has always been the location GM has put this


its a kind of a block circulation process but air(vacuum) instead of water(pressure)

good luck
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Old Mar 17, 2007 | 08:59 AM
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Wow. These responses were never emailed to me. Thanks for the help. I guess i'll stick with GM's routing.
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