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  • question about head gasket

    every site i can find only lists a 80mm or higher head gasket bore. my rb20 is only a 78mm bore in the block. am i ok to use the 80mm bore? or is there somewhere i can buy the 78mm? thanks!
    3 assorted slightly modded 240sx-sold
    1992 240sx rb20det powered made 380whp on Dyno

  • #2
    Headgasket squishes a bit when head is torqued down, so 80.5mm headgasket is for 78mm cylinder bore.

    For example with Tomei headgasket for RB20DET -

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    • #3
      perfect. thanks skym!
      3 assorted slightly modded 240sx-sold
      1992 240sx rb20det powered made 380whp on Dyno

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      • #4
        digging up old thread here, but if what skym says is right, then could you explain this 78mm HG? http://www.frsport.com/Cometic-H2549...-_p_12694.html
        the tomei squishes more or something?
        - Adam

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        http://forums.gtrcanada.com/gts-project-cars/44846-project-nashzilla-r32-gt-t-neo.html

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        • #5
          Maybe that's why Cometic gaskets are worst than OEM ones.
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          • #6
            The seal around cylinders is thinner with that metal headgasket. Factory seal around cylinders looks frayed in comparison to metal headgasket, but factory headgasket seal is still thicker than that metal headgasket with thinner seal. Most good aftermarket headgaskets have a thick, sharp edge looking factory headgasket like seal around cylinders.
            Last edited by Skym; 04-21-2011, 01:25 PM.
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