2004 impala 3.8 series 2 holes in manifold problem

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  • #12814 Reply


    I have a 2004 Chevy Impala 3.8, took the upper and lower manifolds off and there are 4 coolant holes around the 6 cylinders , 2 on each side the one on passenger side in the rear was plugged with what reminded me of particle board, i removed it easily, now on the manifold there is just 2 holes both on drivers side one in front and one in back, on the passenger side front there is no hole at all it looks to be aluminum. on the passenger side rear of the manifold, looks like a hole should be there but is filled with very hard junk like i dug out of the engine but it is not coming out so easily and it doesn’t look like there is a water channel there anyway. Are all these holes suppose to be open or is this junk suppose to be in there clogging holes? and how many open holes are in the manifold?


  • #13885 Reply


    Clean as necessary and just replace the gaskets. Some water jackets are not used, but will get build-up with age and use. No worries…

  • #16750 Reply


    Stick your screw driver in the holes. If it goes all the way through, then clean them out because they are being used.
    If it bottoms out, then do ot worry about it. Just clean it as best you can.
    Like Jake said, some passages are not used.

    I believe there are 10 bolt holes for the manifold bolts.

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