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Early design 89 prop valve question

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Old May 16, 2011 | 05:09 PM
  #1  
lonesomeloser's Avatar
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From: Middletown, MD
Car: 1983 Z28
Engine: 305
Transmission: 700R4
Early design 89 prop valve question

Went to install it today but on the new valve there is a "block-off" with a black cap on the very front of it. Well, this is where the rear brake line attaches the the one in my car now. So my question is, do I have to remove the cap and such, and place all that in the unused port, or do I bend the brake line to screw into the underside of the new valve? I was told this is a direct fit.
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Old May 16, 2011 | 05:40 PM
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JamesC's Avatar
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Early design 89 prop valve question

Originally Posted by lonesomeloser
Went to install it today but on the new valve there is a "block-off" with a black cap on the very front of it. Well, this is where the rear brake line attaches the the one in my car now. So my question is, do I have to remove the cap and such, and place all that in the unused port, or do I bend the brake line to screw into the underside of the new valve? I was told this is a direct fit.
It sounds as if your 85 is equipped with the old-style cast iron version of the combination valve. Most were SAE, but I have seen reports where the 85's were metric as well. At any rate be cautious when threading. Check posts #1 and 2 for pics. If you have the old style, you'll have to do some line bending.

https://www.thirdgen.org/forums/brak...rop-valve.html

JamesC
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Old May 16, 2011 | 05:56 PM
  #3  
lonesomeloser's Avatar
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From: Middletown, MD
Car: 1983 Z28
Engine: 305
Transmission: 700R4
Re: Early design 89 prop valve question

Yes it's the old style, and I haven't tried the threads yet. What is the best way to bend the brake line? Right now there 2 loops in the line where it attaches to the front. Should I have those removed? Or bend the line downstream?
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