Rear main bolts

Discussion in ''Da Nailhead' started by Skcor, Dec 11, 2018.

  1. Skcor

    Skcor New Member

    Has anyone use the stud kit from arp for a 401? Just wondering if they allow the oil pump seat. Tried using an old bolt but they are fatigue and snap when I get to 95 ft pounds. Any help will be appreciated.
     
  2. Schurkey

    Schurkey Silver Level contributor

    1. Is 95 ft/lbs the correct torque spec?
    2. When was the last time your torque wrench calibration was checked?
     
    gsgtx likes this.
  3. telriv

    telriv Well-Known Member

    If I remember correctly you need to grind clearance for one con rod & oil pump WITHOUT using one washer.
     
  4. Stevem

    Stevem Well-Known Member

    You can't just swap in studs for bolts without getting the line Bore checked as studs load the block in a different way and the rear Bore may not be round anymore.
    It must be a 1/2" shank bolt to handle a 95 ft lb torque load!
     
  5. telriv

    telriv Well-Known Member

    YES, needs to be checked, but it doesn't seem to affect the "Nails" as much as other engines. Probably because of the skirted block & the added nickel content of the cast iron.
     
    300sbb_overkill likes this.

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