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Thread: 3100 Cylinder Head Bolt Retorque?

  1. #1

    3100 Cylinder Head Bolt Retorque?

    I've got a question for 3100 buffs.

    I replaced head gaskets on my 95 Grand Prix 3100 about 30, 000 miles ago and the lower intake gasket is starting to leak coolant. I plan on replacing the lower intake gasket soon. What I'm wondering is if its a good idea to retorque the cylinder head bolts at this time and if so what should I retorque them to? I had the heads milled, used new GM head gaskets, and installed new head bolts.

    Also, who makes the best lower intake manifold gasket?

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  3. #2
    Site Coder bszopi's Avatar
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    RE: 3100 Cylinder Head Bolt Retorque?

    If you are replacing the lower intake manifold, go with the latest GM gasket which fixes the leakage issue. There is a TSB on here somewhere, or just do a search for it. It will give the part number for the gasket, as well as the revised torquing sequence and values.

    As far as the head bolts go, I don't think it would be a good idea to try to retorque them.
    -Brad-
    89 Mustang : Future 60V6 Power

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  4. #3
    Iron Head Enthusiast geoffinbc's Avatar
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    You cannot. The bolts are torque to yield. You need to torque them with a torque angle meter. There is no Foot Pount torque value for the final pass.
    1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
    1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
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  5. #4
    on a stock motor, retorquing is not needed.

    on a modified engine, i would recommend it,


    modified meaning high compression ration or boost.

    i have personally experienced the head bolts loosening up over time and i swear i have read a gm note somewhere to retorque the head bolts after a few driving sessions.

    i will be retorquing mine.

    you dont really have to "retorque" them, just check to see with a socket and wrench and give it a little "umph"

    if its noticebly loose, retorque it.

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