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85.5mm or 0.020" over headgasket???

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    #1

    85.5mm or 0.020" over headgasket???

    I've searched and searched and I still can't find an answer.

    I would like to bore my stock block to 85.5mm or 0.020"over to ensure "good as new" cylinder bores but I can't find a headgasket. Does anyone know if someone makes a headgasket that's 20over or can a stock one be modified, if so, what would it cost and how would such a modification be done? This is the only thing that's stopping me from buying my pistons and rods right now. I really need to know about this headgasket, if anyone has an answer or at least some insight it would be much appreciated.

    -Kyle
    SOHC Non-VTEC F-series for life

    "It is the fools prerogative to utter truths that no one else will speak."
    -Morpheus (The Sandman)
    Tags: None
    #2
    I think I remember reading that an F23's bore is 86mm, so maybe you could use that gasket

    Comment

      #3
      my engine bore is 85.5mm (.020" over)
      i was using a f22a gasket, but it was not big enough...
      i switched to a f23 gasket and it fit very nice and is holding up well. I did modify it slightly by drilling open 2 coolant ports that are closed on it....
      12.5 at 114.6mph 15psi
      11.7 and 11.5 20.5psi
      F22a1
      60-1 td06h turbo
      Darton mid sleeves
      85.5 wiseco 8.8:1 forged pistons
      Crower pro billet rods
      Custom ported head.
      KMS valves
      F23 headgasket
      ARP H23 headstuds
      H23 upper intake manifold
      F22a6 lower intake manifold
      Intake manifold is gutted
      AEM EMS 1040u
      FIC 850cc injectors
      Walbro 255 pump
      H23 manual trans
      Prelude shifter assembly
      Forbidden short throw
      Nitrous Express Kit installed, never used on this motor

      Comment

        #4
        Well, I talked to my machine shop yesterday and they said that even if we bore the cylinders .020 over, I can still use the stock head gasket.

        Fast93Accord, didn't your headgasket blow out because your pistons stick out like .030 or something?

        Newayz, I'll probably try to run the stock hg, unless I can get one customer fitted at a reasonable price.

        Anyone else have an opinion or a straight answer?

        -Kyle
        SOHC Non-VTEC F-series for life

        "It is the fools prerogative to utter truths that no one else will speak."
        -Morpheus (The Sandman)

        Comment

          #5
          just use an f23. the bore on them is larger. like stated above...check all coolant and oil gallies.
          Turbo f22a/f22b vtec

          Comment

            #6
            honestly the stock F22 headgasket is not good for a 85.5mm bore. Someone else told me they used one so i did, but i did not like the fitment at all. If you put it on the block you will see the gasket actually is in on the bore... use the F23 gasket. it fits much nicer.
            i did blow 2 headgaskets and i think the gasket size was playing a role.
            12.5 at 114.6mph 15psi
            11.7 and 11.5 20.5psi
            F22a1
            60-1 td06h turbo
            Darton mid sleeves
            85.5 wiseco 8.8:1 forged pistons
            Crower pro billet rods
            Custom ported head.
            KMS valves
            F23 headgasket
            ARP H23 headstuds
            H23 upper intake manifold
            F22a6 lower intake manifold
            Intake manifold is gutted
            AEM EMS 1040u
            FIC 850cc injectors
            Walbro 255 pump
            H23 manual trans
            Prelude shifter assembly
            Forbidden short throw
            Nitrous Express Kit installed, never used on this motor

            Comment

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