350 motor mount bolts

Discussion in 'Small Block Tech' started by isidro20001, Sep 17, 2020.

  1. isidro20001

    isidro20001 Active Member

    Could someone please tell me the size of the buick 350 motor mount bolts and the size of the bolts that go through the mount to the block. I pulled my motor and messed up & missed placed them. Thank you all.
     
    isidro20001, Sep 17, 2020
    #1
  2. Dano

    Dano Platinum Level Contributor

    7/16" course thread I think. I just went through this mounting one to a cradle. IIRC I bought fine thread & then has to steal bolts out of a parts car cause they weren't correct.
     
    Dano, Sep 18, 2020
    #2
  3. Storm1

    Storm1 Silver Level contributor

    [​IMG]


    They are 7/16-14 Grade 8 - length is shown above
    They have a tapered shoulder near the hex head. Not a straight shoulder.



    Mount to block bolts are 7-16-14 x 3/4"lg Grade 5
     
    Storm1, Sep 18, 2020
    #3
    Dano likes this.
  4. Dano

    Dano Platinum Level Contributor

    Glad my memory hasn't faded too badly:).
     
    Dano, Sep 18, 2020
    #4
  5. Storm1

    Storm1 Silver Level contributor

    :D Just happen to have mine sitting right next to me at work. Cleaning them up and reusing the OEM bolts because apparently nobody has the long ones with the tapered shoulder in that length.
     
    Storm1, Sep 18, 2020
    #5
    Dano likes this.
  6. Dano

    Dano Platinum Level Contributor

    I couldn't see replacing them anyway.
     
    Dano, Sep 19, 2020
    #6

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