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Equinox Manifold Gasket Set (Notice Any Changes?)

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  • #1

    Equinox Manifold Gasket Set (Notice Any Changes?)

    I recently picked up a OEM gasket set Part #89018139 for the equinox/torrent on ebay, for $25 shipped..... and here is what I discovered:

    * They added a metal tab below the center intake port of the LIM gaskets

    * The set now includes the "Valley Gaskets", Part #12603280
    (The bad news is, GM does not sell this part number separate)

    * The UIM gaskets are the same as the 3500 UIM gaskets

    2000 Grand Am GT
    2011 Chevy Impala

    "The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John Lingenfelter
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  • #2
    Interesting. But I still wouldn't trust em to last forever.

    It's nice the 3900 has BOTH metal LIM gaskets AND doesn't route the cooling through the intake. That way no chance for failure, and even no chance for vacuum leak from the ports around the intakes walking/warping/cracking. My 1st intake gasket had the coolant leak AND vacuum leak. That's right the intake ports were cracked and warped and leaky too. Engine ran so much better after I changed em.
    sigpic New 2010 project (click image)
    1994 3100 BERETTA. 200,000+ miles
     16.0 1/4 mile when stock. Now ???
    Original L82 Longblock     with LA1, LX9, LX5 parts
    Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

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    • #3
      Originally posted by IsaacHayes View Post
      Interesting. But I still wouldn't trust em to last forever.

      It's nice the 3900 has BOTH metal LIM gaskets AND doesn't route the cooling through the intake. That way no chance for failure, and even no chance for vacuum leak from the ports around the intakes walking/warping/cracking. My 1st intake gasket had the coolant leak AND vacuum leak. That's right the intake ports were cracked and warped and leaky too. Engine ran so much better after I changed em.
      I don't expect them to last forever, however the improvements are nice.
      The 3900 is nice, but irrelevant in terms of gasket design for the 3100, 3400 and LX9 3500
      2000 Grand Am GT
      2011 Chevy Impala

      "The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John Lingenfelter

      Comment

      • #4
        Right, just saying GM finally resolved the gasket issues with a good design in the gen 4 motors.
        sigpic New 2010 project (click image)
        1994 3100 BERETTA. 200,000+ miles
         16.0 1/4 mile when stock. Now ???
        Original L82 Longblock         with LA1, LX9, LX5 parts
        Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

        Comment

        • #5
          those are 3400 valley gaskets?

          Do they not have the little studs on them that the 3500 ones have?

          Got Lope?
          3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
          Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
          Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
          12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBS

          Comment

          • #6
            Originally posted by 3400-95-Modified View Post
            those are 3400 valley gaskets?

            Do they not have the little studs on them that the 3500 ones have?
            Yes they have the little studs on them, so you would have to drill the block to use them. Not really a big deal as it only takes 20 mins top to locate and drill the block.
            2000 Grand Am GT
            2011 Chevy Impala

            "The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John Lingenfelter

            Comment

            • #7
              so then this is a 3500 lower intake set...

              ok wait, looking at the port it's not, its a 3400 set, but why on earth include valley gaskets that wont fit... that just doesn't make any sense, unless there are direction on how to locate the holes and drill it with the pack of info.

              3500 valley gaskets are P/N 12579142 I have a set right here... I wonder if they are different.
              Last edited by 3400-95-Modified; 09-29-2008, 10:12 PM.

              Got Lope?
              3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
              Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
              Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
              12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBS

              Comment

              • #8
                The 3400 equinox/torrent block is drilled from the factory for the valley gaskets. I drilled the block in my 2001 GAGT for these gaskets when I did the 3500 top end swap a few years back. My second car (2000 GAGT) is now leaking coolant from the LIM so I figured I would pick this set up since it was cheap.

                Locating and drilling the holes is simple, below is a pic of what 20 mins of careful locating and drilling achieved. I located the holes with a dot of axle grease on the studs and then grease the drill bit with a vac running to catch any shavings.

                2000 Grand Am GT
                2011 Chevy Impala

                "The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John Lingenfelter

                Comment

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