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stainless bolts for exhaust manifold?

Discussion in 'The Hokey Ass Message Board' started by scotty t, May 19, 2012.

  1. will i have any issues using stainless bolts for my exhaust manifolds on my 348 chevy? a buddy says not to use them he says they won't stay tight. something about expansion rates?
    thanks
     
  2. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,949

    gimpyshotrods
    ALLIANCE MEMBER

    I have been using them for a few decades. No problems with them staying tight. Maybe I'm doing it wrong.
     
  3. Special Ed
    Joined: Nov 1, 2007
    Posts: 5,770

    Special Ed
    Member

    You should check, and (possibly) re-tighten them after a few hot/cold cycles. But you'd have to do that with any kind of bolt. Listen to Gimpy.
    Oh yeah... use a little anti-seize, too.
     
  4. bbfmavrick
    Joined: Feb 6, 2007
    Posts: 7

    bbfmavrick
    Member

    Definately:)
     
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  5. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,346

    seb fontana
    Member
    from ct

    Me too!!
     
  6. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,949

    gimpyshotrods
    ALLIANCE MEMBER

    Yeah, that too. It is such a regular part of my routine, that I forget to mention it.
     
  7. thanks guys, stainless bolts installed.
     
  8. lakeroadster
    Joined: Nov 6, 2008
    Posts: 604

    lakeroadster
    Member
    from *

    Stainless has a higher "thermal expansion rate" than steel. Basically that means that as the steel manifold and stainless bolts heats up, the manifold to head gasket loading decreases due to using stainless bolts.

    It's hard to argue though with folks that have actually used stainless bolts with success.

    Sometimes the laws of physics don't amount to shit if they are trumped by actual experience :D
     
  9. Throw a lock washer under them and motor on. I see no problem using them.

    Bob
     
  10. langy
    Joined: Apr 27, 2006
    Posts: 5,735

    langy
    Member Emeritus

    I've used them for around the last 40 years, never been a problem for me.
    ARP make and sell stainless header bolts, I guess they dont know :)
     
  11. marioD
    Joined: Nov 20, 2005
    Posts: 231

    marioD
    Member

    works fine if you use some coppergrease on the bolts and retighten frequently...



    Mario
     

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