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LS6 valley cover swap

This is a discussion on LS6 valley cover swap within the General Help forums, part of the LSx Technical Help Section category; Ok guys so I'm getting ready to swap my valley cover on my 98 TA. I have the LS6 intake ...

  1. #1
    Senior Member JayTA98's Avatar
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    1998 Trans Am

    LS6 valley cover swap

    Ok guys so I'm getting ready to swap my valley cover on my 98 TA. I have the LS6 intake already on it. I just want to address the oil issue in the intake.
    I want to put anoher pipe assembly on the back and connect it with another assembly in the front with a T fitting. I'm going to use the stock PVC valve and make the new piece of pipe from new hose. I just want to make sure I order all the parts I need. This is what I got so far:

    GM 12602544 pipe assembly x 2
    GM 12551933 gasket x4 (I keep reading that I need this to get a good seal)
    GM 12568002 LS6 valley cover x1

    Is that it? Does the stock bolts of the LS1 coolant pipe will work with the new assemblies? or do I need to get the new bolts too? If I do does anyone have the part nuber for the bolts? Do I have to use the stock PVC with this setup or can I use the replacement PVC 1009 with the small hole in it? Do I need anything else? Thanks guys.

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    Moderator Cutlass's Avatar
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    2001 Silverado Z71

    don't forget the plug for the rear of the left valve cover #12568011
    Also I used the valley cover with the PCV orfice built into it #12577927
    If you use the valley cover #12568002 you can use either the stock pcv valve or the fixed orfice PCV valve.
    The stock coolant tube bolts are reusable.
    Why and how are you gonna use 2 coolant pipes instead if the coolant plugs for the rear?

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    Senior Member JayTA98's Avatar
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    Well the reason I don't want to use the plugs is because all the write ups about how can it hurts #7. I'm going to put one assembly on the back and join it with the one in the front.

    This other valve cover that you said has the PCV orifice in it, do you have a pick from it? and is it easy to access the PCV for replacement?

  4. #4
    Moderator Cutlass's Avatar
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    Every LS engine (that I've seen) since the first couple years of the LS1 has used the rear coolant plugs, so I don't think there is too much harm in using them.
    Is there enough room under the intake to join the front and rear coolant tubes?
    The PCV isn't replacable in the other valley cover. Its a built in orfice.

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