Pin Hole In my J Head

Small Block Mopar Engine

  1. daniel9843

    daniel9843 Active Member

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    Hi there i was just wondering if many have come across this problem. I have a set of J cast 360 heads with a pin prick size hole in the intake short turn, i am a bit worried about putting these heads on as the hole is on top of the coolant gallery.
    I have been told to put some sort of chem weld in the cooling system on first start up as it will help seal, evidently the area is to thin to weld. i need these heads to get me around on the street and for a little bit of drag race use. Would i be silly to put these on and give them a try? cheers Daniel
     
  2. tubtar

    tubtar Well-Known Member

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    This sounds like a job for Moroso ceramic seal.
    I have had good luck with it over the years.
    Epoxy might be another possibility.
     
  3. K.O. SWINGER

    K.O. SWINGER Well-Known Member

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    x2
     
  4. C130 Chief

    C130 Chief Mechanical Genius

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    If it's someplace you can reach with a drill bit, a taper pin would be the best fix.
     
  5. moper

    moper FABO Gold Member FABO Gold Member

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    Are you sure it goes to the cooling jacket? I'd pressure test the head and if it doesn't hold pressure then worry about a fix...
     
  6. tekslk

    tekslk Well-Known Member

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    Ive had good luck with jb weld.
     
  7. daniel9843

    daniel9843 Active Member

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    yeah that was under pressure test the slight leak was noticed. no body will weld it as its to thin in the area
     
  8. daniel9843

    daniel9843 Active Member

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    the moroso ceramic seal sounds good, but how long will it last?
     
  9. C130 Chief

    C130 Chief Mechanical Genius

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    If you can get it really clean, flow some brass over the porous spot then grind it back down. I'd rather braze it than use epoxy (not saying epoxy wont work).
     
  10. DaveBonds

    DaveBonds Garage Trash

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    Brazing is an excellent, low temp solution.
     
  11. winstoninwisc

    winstoninwisc Taint easy livin free,season ticket ona 1wayride

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    I have a set of 2.02 j heads if needed or sure some 1 can come up with some
    regular 1.88 js or a set of heads I also have 2.02 x heads you can drop on and run if you have a smaller cam there single spring right now 425for the js 450 for the Xs plus about 85 shipping .the js u got the exhaust valves just need to get some 2.02 intake valves. if you know some 1 with the tools to change out and use your rockers and springs for quik build or full build depends on you pocket book drll ,nail weld be best cheap way. I can help you step it up,or getting working heads, or get ready to step it up bigger for racing on the top end pm me for pics I"ll get them up by tommorro or weekend for any 1 else interested
     
  12. duster wonder

    duster wonder National Guard Member

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    too thin to weld? huh ive welded sheet metal with a flux core cant be thinner than that?
     
  13. Jim Lusk

    Jim Lusk Well-Known Member

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    Find another machine shop...
     
  14. daniel9843

    daniel9843 Active Member

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    they are fairly ported went a bit heavy on the short turn
     
  15. moper

    moper FABO Gold Member FABO Gold Member

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    Personally - when I go through (and it's happened a couple times) I toss the head and start again. I'd rather not have pressurized fluid behind an epoxy repair like that because eventually the repair will fail - but it's just me. You could try the epoxy on it. I don't think ceramic sealers will work on a hole. I've used them (Moroso) with success for seaping type leaks. The problem will be you'll need to bring the repair back the that shape or that one port is wrecked anyway.
     
  16. daniel9843

    daniel9843 Active Member

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    spare j heads dont come easy over here in Australia it would be nice...
     
  17. moper

    moper FABO Gold Member FABO Gold Member

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    lol... Yeah - I know. But the rest of the parts to fix a block that has just hydrauliced because the repair failed is probably just or harder...
     
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