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looking for B&B or any one that knows

Discussion in 'Chevy Trucks' started by carl b, Oct 19, 2008.

  1. carl b

    carl b PlowSite.com Addict
    from Ohio
    Messages: 1,330

    the bolts that hold my manifolds to the motor are walking out and now i'm missing two . ( on the back drivers side ) i put a screw driver in the hole and they aren't broke do you know what the size is ? and can i put lock tit on them ? thank you in advance
     
  2. wirenut

    wirenut Senior Member
    from nh
    Messages: 513

    try 3/8-16 or a 14 mm.....
     
  3. William B.

    William B. Senior Member
    from S.E. IA
    Messages: 978

    If you put loc tite on them DO NOT use red. You'll have to heat them to get them to break loose if you ever have to take the intake off again.
     
  4. wirenut

    wirenut Senior Member
    from nh
    Messages: 513

    i've used teflon tape befor on header bolts
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    What engine? Makes a difference in the thread size.
     
  6. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588


    14mm wow thats way to big. :dizzy:

    its 3/8 for old stuff and ls 4.8-5.3-6.0 up stuff is 8mmx1.50
    if i recall correctly on the 8mm.
     
  7. carl b

    carl b PlowSite.com Addict
    from Ohio
    Messages: 1,330

    its a 5.7 350
     
  8. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Then it's 3/8"-16. :)
     
  9. carl b

    carl b PlowSite.com Addict
    from Ohio
    Messages: 1,330

    thank to you all. now if i can't use red what do i use ? thats the only kind i have. btw i got stainless bolts if the makes a difference.
     
  10. William B.

    William B. Senior Member
    from S.E. IA
    Messages: 978

    I'd use blue or green.
     
  11. carl b

    carl b PlowSite.com Addict
    from Ohio
    Messages: 1,330

    i got it done. went with green because thats the color of the truck
     
  12. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,310

    Don't use stainless they will break, I promise. Blue locktite will be fine.
     
  13. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If they were hardware store grade stainless bolts (18-8) I couldn't agree more. Way too soft for an exhaust manifold application. Don't be surprised if they don't stay tight.


    Either regular old grade 5 bolts, or hi dollar/hi quality bolts if you want stainless.
     
  14. RichG53

    RichG53 PlowSite.com Addict
    Messages: 1,135

    What about grade 8 bolts.. ? ? ? ?
     
  15. Danscapes

    Danscapes Senior Member
    Messages: 164

    I replaced all 16 of the manifold studs in my f-250 with stainless ARP bolts, you can get em from Jegs or Summit.
     
  16. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Gr 5 is best in this type of application. As the manifold expands and contracts during the normal heat and cool cycles (stretching the bolt in the process) the gr 5 is "soft" enough to "give" allowing the manifold to "grow" as needed. Gr 8 doesn't allow enough movement.

    And thats the problem with the hardware store grade stainless...it's too soft under this type of condition and will either just continue to stretch and become loose, or the expansion will pop the head off.