2004 LS6 Valley Cover w/ built in pcv Need all part numbers. - LS1TECH - Camaro and Firebird Forum Discussion

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2004 LS6 Valley Cover w/ built in pcv Need all part numbers.

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2004 LS6 Valley Cover w/ built in pcv Need all part numbers.

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Old 09-06-2012, 01:36 PM
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Default 2004 LS6 Valley Cover w/ built in pcv Need all part numbers.

Please let me preface this with I am aware of the old write up using the pre '04 valley cover, but this is for the more revised install. As far as I can find, no one has listed very clearly all the part numbers for doing the updated install as well as instructions. I know this topic has been up for discussion, but I need to hear from one person who has done this mod and exactly what parts they used. I am also not looking to do the catch can mod at this time.

I have done my research and it seems that the best route to solving a bad pcv and/or leak is to replace the valley cover with that of the newer '04 LS6 one that has the oil separator and valve built in. Since the pcv is built in all I would need is the hose connecting to the intake manifold and a cap for the rear driver"s side valve cover. These are the part numbers I found from searching all forums as well as the LS1howto page.
http://www.ls1howto.com/index.php?article=18

Here are the parts that I think I should order.

12577927 (valley cover, comes with bolts & gasket)
12594779 (hose)
12568011(driver's side valve cover cap)
1 5/16" vacuum cap (to cover passenger side valve cover)

Is this everything I would need to do the install and is it basically the same as the ls1howto, but with small variations to accommodate the built in pcv? I cannot have the car out of commission for long, so I have to order everything at once so there are no delays once I start taking apart the car.

Thank you for your input.
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Old 09-15-2014, 12:16 AM
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Been searching for the answer to this. If I were to order the new in built pcv cover, I can then delete the hoses wrapped around the intake dealing with the old pcv system? I have a 99 trans am.
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Old 09-15-2014, 07:20 AM
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Ekim, you're on the right path but keep in mind that the intake manifold needs to come off. At a minimum, you'll need new intake manifold gaskets.

Warrior, yes.
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Old 09-15-2014, 07:58 AM
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Post #15, hope this is what you're looking for.

https://ls1tech.com/forums/chevrolet...ld-thread.html
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Old 09-15-2014, 01:11 PM
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Originally Posted by BrokeSolid View Post
Post #15, hope this is what you're looking for.

https://ls1tech.com/forums/chevrolet...ld-thread.html
You're the breast... er... best!

Here's what one needs:
12577927 - '04 LS6 Valley*
12594779 - Valley to Intake Hose
12568011 - Valve Cover Plug

98-00 with LS1 intake manifold will also need:
12602540 - Coolant Plugs (must order two of that part number)
12602548 - Crossover Tube

*- You can reuse the red shipping cap on the breather line to plug the rear breather hose of the passenger valve cover. Otherwise, you need to find yourself an additional, generic vacuum cap.

You'll also likely need new manifold gaskets. 12533587 is ACDelco; 92438 is Fel-Pro.
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Old 09-15-2014, 05:21 PM
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Thanks guys.exactly what I was looking for. Went through dozens of threads and that one didn't show up
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Old 09-22-2014, 01:09 PM
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and don't forget cutting is required, it isn't a direct fit, there's a piece about midway on the driver side of the valley that has to be cut to clear the ls6 valley cover, use lots of rags and grease to capture the shavings, I don't remember how much I had to cut off, but there's a measurement somewhere on this forum
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Old 09-22-2014, 02:31 PM
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Oem prices from us if your still looking to do this... 1-2 days to get plus shipping but we have a promo code since we are a new sponsor for discounted shipping


12577927 (S)COVER 1 $73.08
12594779 (S)TUBE 1 $2.71
12568011 (S)PLUG 1 $6.38
12602540 COVER 2 $7.62 ea
12602548 (S)PIPE 1 $24.31
12533587 (S)GASKET 1 $51.35

Let us know if we can help
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Old 09-23-2014, 07:41 AM
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For this job in a Camaro or Firebird, I would recommend while you're in there replacing the oil pressure sending unit with a nice new one.
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Old 09-24-2014, 07:21 AM
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Originally Posted by Nissan LS240 View Post
and don't forget cutting is required, it isn't a direct fit, there's a piece about midway on the driver side of the valley that has to be cut to clear the ls6 valley cover, use lots of rags and grease to capture the shavings, I don't remember how much I had to cut off, but there's a measurement somewhere on this forum
I am pretty sure that piece that needs to be cut is actually on the passenger side. Also from what I have read depending on the year of the OP's vehicle there is a slight chance no cutting will have to be done since some LS6 blocks were placed in 2001-2 Fbodys.
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Old 10-23-2014, 10:12 PM
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does the truck manifold need anything different to convert,besides the valley cover?
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Old 10-25-2014, 09:29 AM
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I have one for sale if you're interested. I only used it for ~2500 miles, so it's like new.
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