Small hole in head at bottom of valve cover bolt!

Small Block Mopar Engine

  1. Mike67

    Mike67 Well-Known Member

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    Also I don't think a plug/stud would fall out as it looks like the breach is in the radius of the roof, looks like you still have metal on the wall that would bottom it out.
     
  2. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    It's GREAT in its element. But I have to admit, I've seen it let go in a gasoline environment. Was it applied wrong? Maybe, but it still let go. And contrary, like you, I've seen it hold up on gas tanks. Who da heck knows?
     
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    • JG1966

      JG1966 Well-Known Member

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      That's exactly what I was going to do. Cut down a small bolt, put a notch in it and thread it down with red loctite. It won't go anywhere and no chance for it to enter the engine. I poked around with a small screwdriver and there's really no more material that can come off.
       
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      • Bobzilla

        Bobzilla Well-Known Member

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        Don’t over think this. Many heads have this happen after porting. If you want to keep bolts for a stock look, use thread sealer. Just have to remember to apply sealer every time bolts are removed. If you switch to studs you can use the new orange thread locker on the studs and they will stay permanently sealed.
        Just make sure you use some kind of sealer on the threads that go in that hole to prevent a vacuum leak.
         
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        • yellow rose

          yellow rose Overnight Sensation FABO Gold Member

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          That happens on every ported head I’ve ever done. You don’t need any sealer on it. Screw the bolt in there and leave it alone.
           
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          • yellow rose

            yellow rose Overnight Sensation FABO Gold Member

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            Tree’d by Bobzilla. My answer is he same. Screw the bolt in there and send it
             
          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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            Oh you'd say send it if it had a crack two feet long. LOL
             
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            • 512Stroker

              512Stroker We are all here because we are not all there.

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              If you dont care for all the quick fix methods, there is nothing wrong with taking to a reputable shop and have it welded and ground back.
              I have seen many heads and blocks repaired via welding it just has to be done correctly.
              Good luck
               
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              • JG1966

                JG1966 Well-Known Member

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                Thanks Yellow Rose. I do know it's been like that for a while and I've never had an issue (that I know of). I'm gonna do something, but nothing too complicated or something that could potentially make it worse.
                 
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                • JG1966

                  JG1966 Well-Known Member

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                  Thanks Bobzilla. This may seem like a dumb question but let's say I use sealant and leave the hole untouched. Does that hole affect the performance of that cylinder because the wall is not "smooth"
                   
                • yellow rose

                  yellow rose Overnight Sensation FABO Gold Member

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                  Nope. I’ve posted a couple of pictures of what the finish is like on my ports. It’s pretty rough.
                   
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                  • Oldmanmopar

                    Oldmanmopar Going left turning right FABO Gold Member

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                    Run a real short 1/4-20 set screw down in the hole as far as possible after cleaning it with brake clean. Then fill the hole with JB weld quick set from the port up against the set screw. I have very short set screws in the shop if needed. I am in Pa. so it would only cost a stamp.
                     
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                    • 512Stroker

                      512Stroker We are all here because we are not all there.

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                      Look at the spark plug from that hole, it will tell you the story.
                      Post a pic of the plug.
                       
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