ARP Main Studs / Head Studs

Small Block Mopar Engine

  1. dart73br

    dart73br Member

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    Hello folks,

    reading the ARP instructios it says 110lb/ft of preload for main studs and head studs. Is that correct? It seems too much...
     
  2. RammerJammer75

    RammerJammer75 Well-Known Member

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    I have always followed their instructions when torquing their fasteners without an issue. If it calls for 110, that's exactly what I would do, in three equal steps if I remember right.
     
  3. Demonracer

    Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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    ^^^^^^^ What he said.
     
  4. furrystump

    furrystump Well-Known Member

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    I also would follow the instructions. One thing I hadn’t thought of when I questioned the torque value was that the studs are fine thread. So more friction to overcome?
     
  5. yellow rose

    yellow rose Overnight Sensation FABO Gold Member

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    If you don’t put a bore gauge in the hole after you torque the cap, you won’t know how much it distorts. Then let it sit for 20 minutes, knock it loose and torque it again to the same number and see if it distorts the same. It probably won’t.

    Stock caps usually won’t take that much load without having issues. So you need to back the torque off so it won’t distort the bore differently even time you tighten it down.

    Aluminum caps are horrible for this. No way can you put all that load on them.
     
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    • flyfish

      flyfish C8H18+N2O = :-D

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      I have been using ARP head and main studs since...well....a really long time (18 years I think). I have always torqued them to their spec (110ft/lbs), no issues with that ever. This was on 3 different motors, all with aluminum heads.
       
    • dart73br

      dart73br Member

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      I'm stalling pretty strong Steel Caps so I don´t think it would distort. More concerned about the stress this can cause on the engine block.
       
    • dano

      dano Evil Handy Man

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      Be sure 110 ft/lbs is the correct torque for the fastener thread size and the type of lube used on the threads.
       
    • Demonracer

      Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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      If you contact ARP, they will text or email you the instructions for installing or reinstalling their fasteners.
       
    • yellow rose

      yellow rose Overnight Sensation FABO Gold Member

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      If you are using a steel cap or even the good ductile iron caps then thy should take 110 no problem.
       
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