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Missing Header Bolt = Engine Noise?

This is a discussion on Missing Header Bolt = Engine Noise? within the General Help forums, part of the LSx Technical Help Section category; I been hearing a tapping noise in my Z28's engine. It goesn't go away at warm-up and increases with acceleration. ...

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    Junior Member David Ray's Avatar
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    Missing Header Bolt = Engine Noise?

    I been hearing a tapping noise in my Z28's engine. It goesn't go away at warm-up and increases with acceleration. Today, I tried to isolate the sound and tracked it to the driver's side of the engine. I discovered that the front header bolt was missing on that side. Could this cause the tapping? Can I replace the bolt or does the gasket have to be changed as well?

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    Quote Originally Posted by David Ray View Post
    I been hearing a tapping noise in my Z28's engine. It goesn't go away at warm-up and increases with acceleration. Today, I tried to isolate the sound and tracked it to the driver's side of the engine. I discovered that the front header bolt was missing on that side. Could this cause the tapping? Can I replace the bolt or does the gasket have to be changed as well?
    Gasket is most likely fried from the heat. It wont take long at all to get a set of MLS(metal) gaskets from autozone and a set of locking header bolts installed.

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    Junior Member David Ray's Avatar
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    What do the bolts have to be torqued to? What are locking header bolts? They have them at A.Z.?

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    Quote Originally Posted by David Ray View Post
    What do the bolts have to be torqued to? What are locking header bolts? They have them at A.Z.?
    Yup. item number sta_8900. They prevent the bolt from backing out.


    18 foot lbs

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    Junior Member David Ray's Avatar
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    What about that copper gasket sealant? Is it any good? Should I change both sides or do I have to 'cause I ain't tried it before and I don't want to screw anything up.

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    Quote Originally Posted by David Ray View Post
    What about that copper gasket sealant? Is it any good? Should I change both sides or do I have to 'cause I ain't tried it before and I don't want to screw anything up.
    The kit will be for both sides. Do it once and right. No sealant is needed

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    I'd avoid the sealant, as long as your headers have fairly thick flanges you should be fine. Although there is no need to do anything to the other side, it wouldn't be a bad idea to at least install the locking bolts, which means you may as well swap out the gasket too.
    Last edited by pajeff02; 05-10-2009 at 01:47 PM. Reason: Too slooooooow

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    Junior Member David Ray's Avatar
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    10-4. Thanks alot.

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    Member DaddySS's Avatar
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    You might want to prepare yourself for the worst. Very few instances of bolts backing out, more often than not, they are missing because they were cross threaded or stripped. Take your time and as said above - do it once and do it right.

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    Veteran 0rion's Avatar
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    try to put a bolt back in there first. I bet that'll fix your problem.

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    Junior Member David Ray's Avatar
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    Do I need to use anything on the threads since the heads are aluminum?

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    Junior Member David Ray's Avatar
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    I forgot to add that the gaskets now in place are metal. Will that make any difference?

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    I didn't use anything on my header bolts but if they're stainless bolts you can put a little antiseize on there if you want too. Check and make sure it's not stripped or something like that and put a bolt in there. Imagine that should take care of it. The stock gaskets are metal and extremely durable.

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    Junior Member David Ray's Avatar
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    Thanks.

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