Exhaust Leak or Valve Clicking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by johnny reb, Feb 16, 2001.

  1. johnny reb

    johnny reb 1/2 ton status

    Mar 6, 2000
    Likes Received:
    Pittsburgh, PA
    The new 350 that I just put in less than 1000 miles ago is already clicking. I'm hopeful that it's only an exhaust leak from my headers. It only clicks when I'm accellerating. If I rev it up while in park, there is no clicking. Does this sound like an exhaust leak somewhere? I just bought some of the dead soft aluminum header gaskets and Stage 8 locking header bolts that I'm going to put on this weekend. Hopefully that will solve the problem. What is the reason that an exhaust leak causes a clicking noise?

    86 K5, new crate 350, Edelbrock intake, Quadrajet, Flowtech headers, rebuilt 700r4, NP208, 33x12.50x15
  2. HarryH3

    HarryH3 1 ton status Author

    May 31, 2000
    Likes Received:
    Georgetown, TX
    A small exhaust leak, right at the head, can sound very much like a ticking lifter. It's a high-pressure pulse that's being forced out through the leak. To your ear it sounds like a clicking sound. Tighten all your header bolts first as they tend to loosen quickly after the first few heat/cool cycles.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>

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