Wet Bolts... which ones?

Engine, Trans & Driveline

  1. Rick Rockett

    Rick Rockett FBBO Gold Member FBBO Gold Member

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    Big block with OEM heads.... which exhaust manifold/header bolts are “wet”? (I have all bolts; no studs).
    I guess RTV is recommended on those threads, but is it absolutely necessary? (I reinstalled my headers without RTV on all the bolts.)
    Are *all* the bolts “wet” or just certain ones?
    Rick
     
  2. Kern Dog

    Kern Dog FBBO Gold Member FBBO Gold Member

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    The two outer bolt holes are open to the coolant passages.
    No, RTV is NOT the recommended sealant!
     
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    • Big Bad Dad

      Big Bad Dad Well-Known Member

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      Thread sealant or maybe pipe dope. NOT silicone....
       
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      • Rick Rockett

        Rick Rockett FBBO Gold Member FBBO Gold Member

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        The two outers at each corner (2 x 4 = 6 total) ??
        Is sealant use on the threads a *must*?
         
      • mr. b

        mr. b Well-Known Member

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        all the holes are wet on a big block
         
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        • Kern Dog

          Kern Dog FBBO Gold Member FBBO Gold Member

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          Shoot, Mr B may be right! I have had aluminum heads since 2003 so I thought only the outer bolts were into the passages.
          By that, I mean OUTER. One per corner....But now you have me wondering about that!
           
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          • old guys rule

            old guys rule Well-Known Member

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            Most are wet bolts coat them all to be certain
             
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            • Rick Rockett

              Rick Rockett FBBO Gold Member FBBO Gold Member

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              What’s the recommended sealant material for the threads??
               
            • dadsbee

              dadsbee FBBO Gold Member FBBO Gold Member

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              Permatex thread sealant or Loctite PST-592.. RTV is for roof flashings !
               
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              • Lefty71

                Lefty71 FBBO Gold Member FBBO Gold Member

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                The closed chamber '915's I just did this fall were wet, every single one. I used Permatex as (I do believe) was recommended by KhryslerKid and had no issues from the get-go. :thumbsup:
                 
                Last edited: Nov 17, 2019
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                • cryplydog

                  cryplydog FBBO Gold Member FBBO Gold Member

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                  Non hardening pipe dope, I use Rector Seal Brand from the plumbing shop. there are also other brands that are just as good.
                   
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                  • multimopes

                    multimopes FBBO Gold Member FBBO Gold Member

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                    I recall a fairly recent thread that recommends studs over bolts due to a shoulder on the tapered studs that help seal against the head.
                    In my case, I have a mix of bolts and studs on my 440. Bought it that way. I do get a tiny bit of weeping from the bolts in very cold weather! Must be true!
                     
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                    • 33 IMP

                      33 IMP Well-Known Member

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                      Not necessarily. Depends on which casting. 906s on my 440 are all wet, two sets of 286 heads, all four have only the first and last holes wet.
                       
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                      • khryslerkid

                        khryslerkid FBBO Gold Member FBBO Gold Member

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                        And rain gutters! :thankyou:

                        Just do all of them. I did just four corners and had the second one back on the passenger side start to leak.

                        Use Permatex #2 You can't go wrong. The stuff is older than me.
                         
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                        • JimCoronette

                          JimCoronette Well-Known Member

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                        • khryslerkid

                          khryslerkid FBBO Gold Member FBBO Gold Member

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                          That's a Teflon mainly used for pipe and hydraulic fittings. Not saying it won't work.

                          I've been useing the Permatex #2 from day one. It's what it was originally designed for, water jacket bolt sealant. Removing bolts from exhaust manifolds that I had installed myself was proof enough for me. It was still somewhat pliable after many heat cycles and it never leaked.
                           
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                          • 62440

                            62440 Well-Known Member

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                            I had the 4 outside bolts on my 906 heads leaking. I cleaned the threads with brake cleaner until they were squeaky clean and let dry for a day. I replaced the bolts with studs and slathered Permatex high temperature thread sealant on all threads and they still leaked a bit. A "Old Mopar Guy" from my parts store recommended "Aisin" Semi-Drying Liquid Gasket Gray and no more leaks. It's OEM Specified and low and high temperature recommended for pretty much anything. I don't know how available it is. He had to special order it. Hope that might help
                             
                            Last edited: Nov 20, 2019
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                            • Moparwrench

                              Moparwrench New Member

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                              All holes go into coolant- I use permatex hardening- #1 holds the bolts tight too & I've been doing this for over 30yrs
                               
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                              • 33 IMP

                                33 IMP Well-Known Member

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                                Again, Not all heads have all the holes going into water jackets. Most aftermarket aluminum heads are dry, earlier oem heads only have two bolt holes into the water, the very end holes on each head. I should know I have two sets of heads that way.
                                I will admit that most on this forum are dealing with later heads, and they are open to water, but if someone assumes theirs are open, loads up the bolt with sealer, and then puts it in a dry hole, problems can result.
                                Best procedure is: pull one bolt at a time, see if it is a wet or dry hole, if it is wet, seal it!
                                 
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                                • Rick Rockett

                                  Rick Rockett FBBO Gold Member FBBO Gold Member

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                                  So I re-pulled all my bolts on the header that I had previously removed.
                                  ALL were wet bolts.
                                  Resealed with Permatex High Temp Sealer... followed the instructions: do not use on first 2-3 leading threads; apply to only 1/4 turn of threads (not "all the way around" the bolt).
                                  Worked great!
                                   
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