1. Ghostrider 67

    Ghostrider 67 FBBO Gold Member FBBO Gold Member

    Messages:
    17,830
    Likes Received:
    30202
    Joined:
    Oct 16, 2014
    Location:
    Salisbury, Vermont
    Local Time:
    12:46 AM
    LOL. Giving a head a chance to continue it's life on your engine. What would be a good permanent fix for a rear freeze plug on a head that is damaged? The PO put a expanding rubber plug in it and called it good. Not my style.
    I want a permanent solution that looks good. It appears that someone ground down the plug boss but ran out of real estate before arriving at a sealable plug shape. How to build this back up? Discuss please.
    First pic is the drivers side undamaged head.

    0115200919.jpg 0115200919a.jpg 0115200919b.jpg
     
  2. vance.dykes

    vance.dykes Well-Known Member

    Messages:
    334
    Likes Received:
    256
    Joined:
    Sep 22, 2017
    Location:
    florida
    Local Time:
    12:46 AM
    i think a good welder would be able to fix that.or maybe weld it closed as long as you dont let it freeze you should be good
     
    • Agree Agree x 4
    • Thanks! Thanks! x 1
    • Ghostrider 67

      Ghostrider 67 FBBO Gold Member FBBO Gold Member

      Messages:
      17,830
      Likes Received:
      30202
      Joined:
      Oct 16, 2014
      Location:
      Salisbury, Vermont
      Local Time:
      12:46 AM
      Are you referring to having metal added to the damaged area? Of so, how would you retain the perfect circle for the plug?
      I wondered about welding in new metal 100% and re drilling the plug hole?
       
      • Like Like x 1
      • 5.7 hemi

        5.7 hemi FBBO Gold Member FBBO Gold Member

        Messages:
        12,023
        Likes Received:
        8491
        Joined:
        Dec 21, 2008
        Location:
        ca
        Local Time:
        11:46 PM
        Weld it up solid, don’t use a plug.
         
        • Agree Agree x 6
        • Like Like x 1
        • Thanks! Thanks! x 1
        • vance.dykes

          vance.dykes Well-Known Member

          Messages:
          334
          Likes Received:
          256
          Joined:
          Sep 22, 2017
          Location:
          florida
          Local Time:
          12:46 AM
          i have watched Dart Automotive weld up a cylinder head then use a c n c machine drill out the hole for the plug.
           
          • Thanks! Thanks! x 1
          • Agree Agree x 1
          • vance.dykes

            vance.dykes Well-Known Member

            Messages:
            334
            Likes Received:
            256
            Joined:
            Sep 22, 2017
            Location:
            florida
            Local Time:
            12:46 AM
            as 5.7 said weld it closed use a stainless steel washer as a plug then weld it closed. that is the cheap way.
             
            • Agree Agree x 2
            • Thanks! Thanks! x 1
            • Ghostrider 67

              Ghostrider 67 FBBO Gold Member FBBO Gold Member

              Messages:
              17,830
              Likes Received:
              30202
              Joined:
              Oct 16, 2014
              Location:
              Salisbury, Vermont
              Local Time:
              12:46 AM
              Okay. thanks. I think I will do exactly that. Find a SS washer that's thicker than normal and weld it in there. Being on the backside is also good.
               
              • Like Like x 2
              • Agree Agree x 1
              • Ghostrider 67

                Ghostrider 67 FBBO Gold Member FBBO Gold Member

                Messages:
                17,830
                Likes Received:
                30202
                Joined:
                Oct 16, 2014
                Location:
                Salisbury, Vermont
                Local Time:
                12:46 AM
              • 33 IMP

                33 IMP FBBO Gold Member FBBO Gold Member

                Messages:
                2,340
                Likes Received:
                2852
                Joined:
                Dec 21, 2017
                Location:
                taxifornia,soon 2b Arizona.
                Local Time:
                9:46 PM
                Since i am not much of a welder, and never on cast iron, i would die grind it as round as i could get it, then drill it the proper size for a pipe tap, tap and plug it . Maybe you could find a decorative plug, allen plug, or maybe chrome..
                I think the BEST solution, would be to have someone who really knows what they are doing, weld it up.
                 
                • Like Like x 2
                • Thanks! Thanks! x 1
                • Agree Agree x 1
                • moparnation74

                  moparnation74 FBBO Gold Member FBBO Gold Member

                  Messages:
                  10,676
                  Likes Received:
                  18021
                  Joined:
                  Mar 27, 2014
                  Location:
                  OHIO
                  Local Time:
                  11:46 PM
                  I agree...I would see if it is possible to tap it....

                  If not weld it shut as mentioned above...
                   
                  • Thanks! Thanks! x 1
                  • Agree Agree x 1
                  • Ghostrider 67

                    Ghostrider 67 FBBO Gold Member FBBO Gold Member

                    Messages:
                    17,830
                    Likes Received:
                    30202
                    Joined:
                    Oct 16, 2014
                    Location:
                    Salisbury, Vermont
                    Local Time:
                    12:46 AM
                    I think I will contact PRH heads up in Burlington VT. They MUST have somebody who can do this.
                     
                    • Agree Agree x 1
                    • moparnation74

                      moparnation74 FBBO Gold Member FBBO Gold Member

                      Messages:
                      10,676
                      Likes Received:
                      18021
                      Joined:
                      Mar 27, 2014
                      Location:
                      OHIO
                      Local Time:
                      11:46 PM
                      Maybe @Challenger340 can chime in for you...IMHO he is one of the beat Mopar engine builders/machine shop
                       
                      • Thanks! Thanks! x 1
                      • Mike67

                        Mike67 Well-Known Member

                        Messages:
                        5,097
                        Likes Received:
                        7746
                        Joined:
                        Nov 23, 2014
                        Location:
                        Woodlands Tx
                        Local Time:
                        11:46 PM
                        Ooooffff!!!! Drill and tap is probably the best way to go as welding cast iron is not for an amateur.
                         
                        • Agree Agree x 4
                        • Thanks! Thanks! x 1
                        • 33 IMP

                          33 IMP FBBO Gold Member FBBO Gold Member

                          Messages:
                          2,340
                          Likes Received:
                          2852
                          Joined:
                          Dec 21, 2017
                          Location:
                          taxifornia,soon 2b Arizona.
                          Local Time:
                          9:46 PM
                          I just flash back to the screw-in freezeplugs used in Boss 429s. Oem's did it, dont see why we can't.
                           
                          • Like Like x 1
                          • Thanks! Thanks! x 1
                          • Stanton

                            Stanton Well-Known Member

                            Messages:
                            1,923
                            Likes Received:
                            1640
                            Joined:
                            Aug 8, 2012
                            Location:
                            ON
                            Local Time:
                            12:46 AM
                            You're not going to weld stainless to cast - PERIOD.

                            You don't need to "weld" that and you'd do more damage anyway.

                            Fix the damaged area with brazing rod - forget welding for that. Hit it with a die grinder afterwards and get the hole as round as you can then install your plug. And the hole doesn't need to be perfectly round when finished, those plugs are a tight fit and will conform to a bit of distortion.
                             
                            • Thanks! Thanks! x 2
                            • Like Like x 1
                            • Agree Agree x 1
                            • WileERobby

                              WileERobby Well-Known Member

                              Messages:
                              6,216
                              Likes Received:
                              7252
                              Joined:
                              Sep 15, 2009
                              Location:
                              State of insanity
                              Local Time:
                              12:46 AM
                              Tap it, screw in a pipe plug with thread sealant. Done.
                               
                              • Thanks! Thanks! x 1
                              • Agree Agree x 1
                              • 68Moparmaniac

                                68Moparmaniac Well-Known Member

                                Messages:
                                690
                                Likes Received:
                                1076
                                Joined:
                                Jan 18, 2019
                                Location:
                                Utah
                                Local Time:
                                10:46 PM
                                Cast iron isn't as hard to weld as many are lead to believe. The area has to be pre heated to about 500 deg. F. but not too much more otherwise the cast iron becomes unstable. Clean the area of previous contaminants, I like to put my cast iron rod in the oven at about 100 deg. F. for a bit before I strike an arc. Weld short beads around the hole until you've added enough material to re-machine the hole diameter for the freeze plug. Don't let the welded area cool too fast, let it cool slowly. Take it to a machine shop if you don't have access to a mill.

                                You can tap it to accept a NPT plug if this is the route you decide to take (Boss 429 stuff) but be careful when you tighten the plug, you can crack the casting. If you don't know how to weld the best bet is to take it to a welding shop for this repair.....IMO
                                 
                                Last edited: Jan 15, 2020 at 12:31 PM
                                • Thanks! Thanks! x 1
                                • Fran Blacker

                                  Fran Blacker FBBO Gold Member FBBO Gold Member

                                  Messages:
                                  6,787
                                  Likes Received:
                                  6304
                                  Joined:
                                  Sep 23, 2016
                                  Location:
                                  Connecticut
                                  Local Time:
                                  12:46 AM
                                  Agree with Stanton braze it. Never worked with silver solder, would it work?
                                   
                                  • Thanks! Thanks! x 1
                                  • Fran Blacker

                                    Fran Blacker FBBO Gold Member FBBO Gold Member

                                    Messages:
                                    6,787
                                    Likes Received:
                                    6304
                                    Joined:
                                    Sep 23, 2016
                                    Location:
                                    Connecticut
                                    Local Time:
                                    12:46 AM
                                    • Thanks! Thanks! x 1
                                    • Stanton

                                      Stanton Well-Known Member

                                      Messages:
                                      1,923
                                      Likes Received:
                                      1640
                                      Joined:
                                      Aug 8, 2012
                                      Location:
                                      ON
                                      Local Time:
                                      12:46 AM
                                      Whether its hard or not isn't the point. A weld in this are just isn't worth the effort unless you're a sucker for punishment !! Its not structural so why go to all the effort of preheating, purchasing special ni-rod, etc. when a simple braze will work. Hell, JB Weld would probably be good enough !!
                                       
                                      • Thanks! Thanks! x 1
                                      • Agree Agree x 1
                                      1. This site uses cookies to help personalise 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.