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Thread: Nailhead valley cover

  1. #1
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    Nailhead valley cover

    I was at a car show today and there was a vendor there selling polished finned valley covers for 401/425s. I was inspecting it and it was made by Elco or something like that. I have heard of it before. It did not look like my factory one. Mine has about a 1 inch neck at the back (not sure what that is for) and it has a large enclosed box under it and I assume it is filled with filter material. Did these engines, my valley cover is a 1959 part and my block is a 1966 425 have road draft tubes and is that where the draft tube took off from. Do you have to put a breather on a valve cover to relieve internal block pressure if you use one of these non vented valley covers?

  2. #2
    Yes, your valley cover is for an engine with a road draft tube. At least most 401s and all 425 would have a pcv system. If you put use a pcv valve you must put a breather on a rocker cover to allow air into the crankcase.


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  3. #3

    valley cover.....

    Yep, and if you are using the pvc system,, then you need to block the hole in the valley cover... because you are sucking dirt/water into the engine there.... or you can come off of there with the pcv hose and use solid rocker arm covers... which is what I would do...
    But you dont need to do both.....

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