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  1. #1

    Default Intake gasket leaks anti-freeze

    Hi, I have a 1999 suburban with a 5.7, 87,000 miles. It is leaking fluid from the back of the engine,drivers side. It looks like it's coming from where the intake manifold and head/block meet. Do I need a new gasket? If so ,any tips on how to or what gaskets to use? Thank you.

  2. #2
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    The proper way to fix it would be to replace the gasket, but I would try tightening the bolts a little bit first. Go easy here, just check & see if they are as tight as the others.

    Another thing you could try, but is not recommended except as a last resort if you really hate engine work would be to try a can of Barrs Leak. Only use 1/2 of the small bottle/can. Get an even mixture of the pellets & the liquid. Give it a couple hours of running to circulate completely. If the leak persists add the rest of the can & give it a couple of days to seal. If it hasn't stopped, then you'll just have to replace the gasket...

    If it comes down to needing gaskets use GM.....
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  3. #3


    That gen of Vortec 305s & 350s are notorious for loosing intake gaskets. I wouldn't wait another day to get it repaired. I replaced mine last spring. After seeing how it all works, it's obvious that a small leak could become a catastrophic failure without notice. Fill the lifter valley with coolant, you'll likely be replacing the engine.
    When you hear hoofbeats, look for horses not zebras.

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