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Thread: ARP Head Studs

  1. #21

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    So which did you use?

  2. #22
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    Based upon Dave's comments, my guess is that he is not happy to name anything, as, although he may have not personally experienced any issues thus far, he does not want any potential responsiblity of anyone else seeing it as a "recommendation" and have any repurcussions or bad feelings his way for providing further information.

    Now... maybe it would have been better to keep quiet and not say anything at all about using something different, but I know Dave well enough to know that's not in his nature! But, what's not in his nature more is providing information which may not be as factually accurate and correct as he possibly can.

  3. #23

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    Then why doesn't he just say so? Head bolts are indeed pretty specific quality and you can't just use anything that "fits". So if he's using something that's not designed as headbolt but has the same specifications it's fine. But I can't figure that out from his comment. Maybe he found some specific headbolt from another company that fit?
    And I sure know it's at own risk. Even ARP can give problems if not used correct. That way nobody can recommend anything.

  4. #24
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    your right garry, i would never recommend using anything other than the correct automotive fastener, however i do use non automotive fasteners and i have had no issues over the last couple of years i have been using them. i have been using stupidly hot boost pressures in my silver vr4 1.5bar to see if one would let go and snap. but no issue yet.
    for an M10 bolt they have about 180000 psi tensile strength and at 54ft/lb torque they have about 9970lbs clamping force the arp 8740 (standard) stud at 62ft/lb torque have 11305lbs clamping force. so less than the ARP 8740 stud but better than than the factory standard stretch bolt.
    but as i said they are not designed for car engines and will be prone to snapping due to fatigue (hot, cold engine cycling) i would still classify them as an experiment.

    Bye for Now!

  5. #25

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    Thats clear, thanks!

    I was in the assumption you used a automotive alternative.

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