Head Bolt Threads - Bonneville Northstar
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Northstar Engines and System Technical Discussion Discussion, Head Bolt Threads - Bonneville Northstar in Cadillac Engine Technical Discussion; Hi there, I have a question about my northstar engine in the 2005 pontiac bonneville. I disaseembled my engine because ...
  1. #1
    rbb
    rbb is offline Cadillac Owners Member
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    Head Bolt Threads - Bonneville Northstar

    Hi there,
    I have a question about my northstar engine in the 2005 pontiac bonneville. I disaseembled my engine because of a broken intake valve. After I removed the heads, I cleaned up the head gasket surface, and poured mineral spirits into the head bolt holes. Then I used a brass wire brush to clean out the threads. What came out when I flipped the block around were a few flecks of aluminum, the same size as when you might go gold panning.
    I'm not trying to be silly, but I really want to know if I should proceed to time-sert the head boltr holes after seeing these flecks? The head bolts have no aluminum on them, and they look like they could be used again.
    Any information that you can provide would be appreciated.
    Ryan
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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Head Bolt Threads

    Think about the friction applied between the steel & aluminum threads when torquing down the heads. I'm no expert, but I think that is normal and nothing to worry about.

  4. #3
    stoveguyy is offline Cadillac Owners Connoisseur
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    Headbolts have special sealer applied to them. Steel bolts/alum block. GM sez replace headbolts.

  5. #4
    rbb
    rbb is offline Cadillac Owners Member
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    Re: Head Bolt Threads

    After I thoroughly cleaned the head bolt holes and ran the new head bolts in and out several times, the new head gaskets are holding well. It's been over 1000kms. Thanks!
    97EldoCoupe likes this.

  6. #5
    97EldoCoupe is offline U.S. Patent #8,740,532 - www.studkit.com
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    Re: Head Bolt Threads - Bonneville Northstar

    My 04 GXP had a dropped valve. Valve spring snapped, valve dropped.

    If you need any parts or studs, let us know.

    Love the GXP's, I might be buying another one again in a couple weeks. Black on black leather

  7. #6
    big greg is offline Cadillac Owners Fanatic
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    Quote Originally Posted by 97EldoCoupe View Post
    My 04 GXP had a dropped valve. Valve spring snapped, valve dropped.

    If you need any parts or studs, let us know.

    Love the GXP's, I might be buying another one again in a couple weeks. Black on black leather
    It's the only bonne worth owning!
    97EldoCoupe likes this.

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