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  1. 8

    6.5 GEP turbo pre combustion cups

    That engine looks fresh. I'm surprised you have no head cracks and the pre-cups are so bad. Is your pump turned up or something? Does this thing run petal to the metal all of the time? I've moved on from head cracks. I'm convinced the head is relieved between the valves to cause it to crack...
  2. 8

    6.5 GEP turbo pre combustion cups

    In the right pic the pre cup is starting to lose material. That's bad. Do replace that one. In the left pic, that cracking is normal. In turbo machinery we call that stress relief cracking. The general rule is that you don't want the cracks to extend across the head gasket fire ring. I think...
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