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  1. #1
    dan725's Avatar
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    head bolts torque ?

    has anyone figured out the torque specs in ft.lbs I know it's 40N.m then 120 degrees then another 90. Any help?


  2. #2
    Gus13letter's Avatar
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    According to this converter http://www.boltscience.com/pages/convert.htm 40nm is 29.50 ft lbs.

  3. #3
    Dave Sharp dav_dman's Avatar
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    i need to be educated on the degree stuff.. i'd go with arp's with lube and 85 ft-lbs.

    do it in steps like they are doing with the degrees, and tighten from inside to outside.


    If you do it in degrees then how about a follow up and you tell US what the gauge reads after the final 90?

  4. #4
    Gus13letter's Avatar
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    Quote Originally Posted by dav_dman View Post
    i need to be educated on the degree stuff.. i'd go with arp's with lube and 85 ft-lbs.

    do it in steps like they are doing with the degrees, and tighten from inside to outside.


    If you do it in degrees then how about a follow up and you tell US what the gauge reads after the final 90?
    They are stretch bolts so you should follow the torque specs then stretch them to the degree you are to stretch them to. I dont think just torquing them to someone else's final specs will be sufficient. I know when we just did my valve train once the 6 stretch bolts were torqued we went back and turned them an additional 90 degrees.

  5. #5
    Water4fire's Avatar
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    I have heard guys reuse the head bolt up to 2 times. They do a sequence of 25, 45, and 65ft. lbs.
    I myself have a set of arp's on the shelf and have not installed them yet, because of some opinions of the gods. So I am not sure on them.

    I do not re-use the stock bolt, but some do!


    .

  6. #6
    Dave Sharp dav_dman's Avatar
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    i would never reuse a stretch bolt. I've never head of blown headgaskets on here so just do what the manual says with stockers and leave it at that. But I would buy new oem and not reuse stretched bolts.

  7. #7
    dan725's Avatar
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    after the final 90 the gauge red 65lbs so i think someone was pretty close.
    brp would have you buy everything new [if you read the manuals]. I measured them and was within tolerance. [live by the book, die by the book ] just because the bolts streched doesn't change the torque just the length. the torque remains the same.

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