Can I use regular torque numbers on my cylinder heads?
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Northstar Engines and System Technical Discussion Discussion, Can I use regular torque numbers on my cylinder heads? in Cadillac Engine Technical Discussion; ...
  1. #1
    isaaccarlson is offline Cadillac Owners Member
    Automobile(s): 1997 deville
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    Can I use regular torque numbers on my cylinder heads?

    The book says 22 Ft lbs -60-60-60°, but that scares me with an aluminum block.
    The numbers in a popular stud kit are 30-60-75 Ft lbs
    I would like to try 22-45-60ish Ft lbs for time serts.
    Has anyone played with straight torque numbers with bolts?
    I read earlier today that someone ended up with about 60 ft lbs when done angle torquing.....

    I would like to put enough clamping force on the heads, but not pull the inserts.
    The thing that scares me the most is not knowing how hard the bolts are pulling on the block with torque angle.


    Please throw ideas in as I am all ears.

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  3. #2
    89falcon is offline Cadillac Owners Fanatic
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    Re: Can I use regular torque numbers on my cylinder heads?

    Quote Originally Posted by isaaccarlson View Post
    The book says 22 Ft lbs -60-60-60°, but that scares me with an aluminum block.
    The numbers in a popular stud kit are 30-60-75 Ft lbs
    I would like to try 22-45-60ish Ft lbs for time serts.
    Has anyone played with straight torque numbers with bolts?
    I read earlier today that someone ended up with about 60 ft lbs when done angle torquing.....

    I would like to put enough clamping force on the heads, but not pull the inserts.
    The thing that scares me the most is not knowing how hard the bolts are pulling on the block with torque angle.


    Please throw ideas in as I am all ears.
    DON'T DO TIMESERTS!!!!! If you MUST go that way, jump straight to "bigserts".......if you prefer the stock headbolts instead of studs, use NORMS!

    I think those who have checked the torque have seen it closer to 80. I think there is a TSB that recommends even more twist than the 180 degrees. There is a reason they do the angle torquing.....I would stick with it.

  4. #3
    97EldoCoupe's Avatar
    97EldoCoupe is offline U.S. Patent #8,740,532 - www.studkit.com
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    Re: Can I use regular torque numbers on my cylinder heads?

    The reason is because of the long head bolt, torque numbers, especially at higher torque load, are inaccurate because of the "spring" in the bolt as it twists. The "twist" is part of that measured reading. That's one reason I don't like the factory head bolt design- twisting the bolt under load into the aluminum block- and the shaft of the head bolt is only .390" dia.

    If you use original bolts, stick to the FSM torque specifications. Also don't go with less than factory for fear of pulling the inserts, because not having enough clamp force to begin with is just as bad as a pulled insert.


    Need parts for your Northstar Engine? www.northstarperformance.com

    Jake Wiebe, developer of the SureGrip™ Cylinder Head Stud Kit

  5. #4
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: Can I use regular torque numbers on my cylinder heads?

    I used 30-60-80 with the shiny studs from the famous maker ^^^ and never worried about block getting damaged because of these high torque numbers.

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