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  1. #1

    Default 427 BB vacum problem!!!!HELP!!!

    We have a 1997 427 BB that runs off propane and we had the motor overhauled. We have put the engine in the 7500 Chevy truck and the vacuum lines are now blowing air...... any help would be amazing.

  2. #2


    That's not quite an intro. First post plea's don't get recieved very well.

  3. #3


    If it's blowing air something got messed up during the rebuild, look at the intake manifold and induction system, make sure a portal isnt blocked by gasket material or trash.

  4. #4
    Master Mechanic bigdaddy77084's Avatar
    Join Date
    Jan 2010
    Houston, Texas, United States


    Can it run backwards,like a detroit diesel?
    95 tahoe 2dr 4x4 200,000+ miles

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