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Thread: Rocker arm studs
          
   
   

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  1. #1
    Madgic123 is offline CHR Member Visit my Photo Gallery
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    Rocker arm studs

     



    what causes the rocker arm studs to start pulling out?? 1979 chevy 350 runs fine until sits a few days then once starts another stud comes loose??

  2. #2
    Itoldyouso's Avatar
    Itoldyouso is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: '27 ford/'39 dodge/ '23 t
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    Stockers are usually just a press fit into the head, not screwed in like high performance ones. So if you get enough pressure on them, they will lose their grip and start coming out. I had a 389 Pontiac with a 421 cam in it. I carried a big hammer with me because these would pull up occasionally, and I would just hammer them back down.

    The more they come out the looser the fit becomes. Someone on here will be able to tell us if there are oversized ones or whatever to fix the problem.


    Don

  3. #3
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
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    drill tap for a thread studs that is the fix or pin them

  4. #4
    halftanked is offline CHR Member Visit my Photo Gallery
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    Like Pat said,the cheapest fix would be to drill and pin to stop them pulling out. The second best is to just tap and install studs in the existing boss, The best is to buy the entire kit,which lets you mill down the bosses,tap and uses the shouldered stud broached with a hex to install. Hank

  5. #5
    BigTruckDriver is offline CHR Member/Contributor Visit my Photo Gallery
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    Quote Originally Posted by Madgic123
    what causes the rocker arm studs to start pulling out?? 1979 chevy 350 runs fine until sits a few days then once starts another stud comes loose??
    Maybe exessive spring pressure ,and or the heating and cooling cycle of the engine causes it to pull out.Are you running "performance springs" on stock heads?
    Friends dont let friends drive fords!

  6. #6
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
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    they make a stud 7/16 -14 bottom 3/8 top dorman pull stud out tap to 7/16-14 screw in done

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