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Thread: Exhaust under intake manifold

  1. #1

    Exhaust under intake manifold

    I've got a 1960 Buick 401 with a confusing problem that maybe one of you have seen. The engine was running perfect and then one day the engine noise was different. The engine noise appeared to be exhaust and was traced to an area under the intake manifold. I assumed it to be a blown head gasket, but after replacing the head gasket the noise remains exactly as before. Both the head and block seemed within tolerances and did not require shaving. I would appreciate any thoughts you might have as to potential causes of the problem. Please send your ideas and suggestions. Thanks
    Last edited by CraigLyon; 08-13-2009 at 09:35 AM.

  2. #2
    Flip the intake over and you will find a soft plug in the middle of the intake. I would bet you will find it is rusted out and the exhaust is coming from there.It is part of the intake heat system.
    Joe T
    37Buick coupe /455 powered
    40 Super convert
    72 GS455 convert 13.0/105
    69 Buick Sportwagon
    92 Road,aster wagon
    04 Rendezvous

  3. #3
    Joe T - You are a genius! You nailed the problem as we found the plug to be rusted out. The intake soft plugs were not locally available so we had to do a temporary patch. Any idea where the plugs can be purchased? Thanks again for the advice.

  4. #4
    Check with :TA Performance
    Their phone number is : 480-922-6807
    Good Luck

    PS if you have an old parts hous in your area, you might check with them. NAPA and Autozone dont have the "old " books
    Joe T
    37Buick coupe /455 powered
    40 Super convert
    72 GS455 convert 13.0/105
    69 Buick Sportwagon
    92 Road,aster wagon
    04 Rendezvous

  5. #5
    Join Date
    Aug 2009
    Posts
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    use a pipe tap and fitting

  6. #6
    The hole is probably 2 inches in diameter. Finding a soft plug will be easier than buying a pipe plug and fitting it in.
    Joe T
    37Buick coupe /455 powered
    40 Super convert
    72 GS455 convert 13.0/105
    69 Buick Sportwagon
    92 Road,aster wagon
    04 Rendezvous

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