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Head Bolt Size

Discussion in 'Engine Building' started by Sed8ed, May 20, 2003.

  1. Sed8ed

    Sed8ed New Member

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    Stupid question but I left my helms at my house and I need to go pick up a tapp. What is the bolt size and thread pitch of the head bolts on an ls motor. Pills, you should know this you just bought the bolts.

    Note, I live over an hour from the garage I am at now
     
  2. solblu

    solblu Senior Member

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    Helms says 11 x 1.5
     
  3. pills_PMD

    pills_PMD Super Moderator

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    sorry.. i didn't end up having to retap any of my threads so i dont know the pitch size ..

    arp's website should have that..
     
  4. Sed8ed

    Sed8ed New Member

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    No worries, I brought one of the old head bolts with me and checked at the machine shop supplier. I didn't need to retap the holes again, I needed a fluted tapp to clean the rest of the threads.
     
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