1990 FIREBIRD 350

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  • #239156

    A customer is asking about this 350 engine that will not hold a head gasket in it.
    The engine was built in another shop a couple years ago and has had head gasket issues ever since.
    Flat top pistons, mild cam, nothing crazy. Last year installed a set of Fel-Pro 1003 head gaskets
    with ARP bolts. car has gone less than 500k since then and now has blown the gaskets again.
    Any recomendations? I ordered a set of MLS gaskets for it this time around.

    #239157
    THE ERI GROUP
    Moderator

      Does it overheat before the gasket fails? If so is there a cooling system problem causing it?

      #239158
      Rainbow Engines
      Participant

        did he upgraded to a serpentine belt system and still have a std rotation water pump

        #239160

        We tackled an overheating issue last year. Flushed the block, new water pump for the serpentine belt and new aluminum rad with dual cooling fans. Has not overheated since, yet still will not hold a head gasket.

        #239172
        RPMS Inc.
        Participant

          Dave:

          Many moons ago we ran into a similar and possibly identical problem.

          It turned out to be a stuck cross over valve.

          It prevented the exhaust from crossing over and caused one head to overheat, crack and blow the gasket.

          #239185
          THE ERI GROUP
          Moderator

            Is there a restriction in the exhaust system creating too much back pressure, and not letting the exhaust gases escape fast enough, also, does it have a nitrous bottle attached?????

            #239306

            WE GOT THE THING APART ON FRIDAY AND FOUND A BROKEN PISTON AND A CRACK IN THE CYLINDER

            #239319

            Better look for abnormal combustion causes. It’s not the build, must be the tuning.

            #239332

            SHE’S BEEN RUNNING WAY TOO LEAN

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