Rocker arm torque

Magnum Engine Swaps

  1. Eric Mulay

    Eric Mulay Well-Known Member

    Messages:
    46
    Likes Received:
    1
    Joined:
    Dec 23, 2019
    Location:
    san luis obispo california
    Local Time:
    8:42 AM
    Anyone know the torque spec for 1997 magnum 360 rocker arms?
    These are new heads lifters and cam.
    I have not done the break in yet because the lifters are loud.

    Plenty of oil pressure and oil coming out of the push rods.

    So.. Um thinking maybe I have them too loose or to tight
    20200909_104005_HDR.jpg
     
    Last edited: Sep 9, 2020
  2. Kendog 170

    Kendog 170 Let the boy go !

    Messages:
    1,352
    Likes Received:
    876
    Joined:
    Mar 10, 2016
    Location:
    Tewksbury Ma.
    Local Time:
    11:42 AM
    I think 21Ft Lbs. Shafts are 30 which you don't have.
     
  3. Kendog 170

    Kendog 170 Let the boy go !

    Messages:
    1,352
    Likes Received:
    876
    Joined:
    Mar 10, 2016
    Location:
    Tewksbury Ma.
    Local Time:
    11:42 AM
  4. RustyRatRod

    RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

    Messages:
    64,455
    Likes Received:
    37407
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    11:42 AM
    No they are not. That's a misprint that's in a LOT of service manuals and elsewhere. The shaft bolts on an LA are the same size as the rocker bolts on a Magnum. 5/16. You torque that to 30 LB FT and see what you get. SNAP The actual torque spec on the LA shaft bolts is 15-17 LB FT. That's a dangerous misprint too.
     
    Last edited: Sep 9, 2020
    • Agree Agree x 1
    • Eric Mulay

      Eric Mulay Well-Known Member

      Messages:
      46
      Likes Received:
      1
      Joined:
      Dec 23, 2019
      Location:
      san luis obispo california
      Local Time:
      8:42 AM
      So... What is it? 15 to 17?
      Or 21?
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

      Messages:
      64,455
      Likes Received:
      37407
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      11:42 AM
      From what I have found the spec is 21. Been looking for a while. That's the only spec that keeps comin up. I sure wouldn't go any farther than that. It would probably do you good to get a service manual for something with that year model Magnum in it so you would have all of that information in one place.
       
    • TT5.9mag

      TT5.9mag Two atmospheres are better than one

      Messages:
      560
      Likes Received:
      541
      Joined:
      May 5, 2016
      Location:
      So cal
      Local Time:
      8:42 AM
      It doesn’t matter one bit if they’re 15, 17, or 21 lb/ft. If they’re tight and making noise you have another problem. Likely preload on the lifters is wrong.
       
    • TT5.9mag

      TT5.9mag Two atmospheres are better than one

      Messages:
      560
      Likes Received:
      541
      Joined:
      May 5, 2016
      Location:
      So cal
      Local Time:
      8:42 AM
      To add, if it’s a magnum roller cam, there’s no reason to break it in.
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

      Messages:
      64,455
      Likes Received:
      37407
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      11:42 AM
      Since he said he may have them too tight or too lose, I was assuming he didn't have them tightened completely. He may not have known they do tighten down all the way. That would certainly make for a noisy valve train. lol
       
      Last edited: Sep 9, 2020
    • TT5.9mag

      TT5.9mag Two atmospheres are better than one

      Messages:
      560
      Likes Received:
      541
      Joined:
      May 5, 2016
      Location:
      So cal
      Local Time:
      8:42 AM
      You ain’t kiddin
       
    • toolmanmike

      toolmanmike FABO MODERATOR Staff Member FABO Gold Member

      Messages:
      52,793
      Likes Received:
      38296
      Joined:
      Jan 18, 2006
      Location:
      Iowa
      Local Time:
      10:42 AM
      Tighten it until it breaks and back it off a half turn! :lol:
       
      • Like Like x 1
      • Kendog 170

        Kendog 170 Let the boy go !

        Messages:
        1,352
        Likes Received:
        876
        Joined:
        Mar 10, 2016
        Location:
        Tewksbury Ma.
        Local Time:
        11:42 AM
        Well I guess I better back off on my 340 Shafts a bit as they are at 30.
         
      • xLURKxDOGx

        xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

        Messages:
        3,947
        Likes Received:
        1322
        Joined:
        Dec 27, 2013
        Location:
        PHX
        Local Time:
        8:42 AM
        If they’re at 30 with aftermarket rockers you’ll never get them off the shafts.

        J.
         
      • RustyRatRod

        RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

        Messages:
        64,455
        Likes Received:
        37407
        Joined:
        Jun 7, 2010
        Location:
        Georgia
        Local Time:
        11:42 AM
        I would do more than that. I would remove the bolts and shafts, check to insure the shafts aren't crushed out of round and then replace the bolts. They are for sure stretched. Hopefully that's all.
         
        • Agree Agree x 1
        1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
          By continuing to use this site, you are consenting to our use of cookies.