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what size are the header bolts

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  • what size are the header bolts

    When i get my headers installed I want to have the studs removed and put socket cap allen bolts in place. I tried looking online and found people say 3 difference sizes. Does anyone here know the size?

    10mm-1.25x 25mm?
    10mm-150x25mm?
    8mm-1.25x25mm?

  • #2
    What kind of car do you have? An LS1 trans am doesn't have studs from the factory. They have bolts and there reusable.


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    • #3
      oh.. I didnt look i just assumed they were studs. I dont want to reuse them. I want to put SS socket cap allen bolts in, looks much cleaner.

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      • #4
        8MM-1.25x25mm


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        • #5
          Thanks!

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          • #6
            be sure to use antiseize or something on the stainless bolts

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            • #7
              Always. Its an aluminum block

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