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Technical 1962 327 SMALL BLOCK CHEVY COOLANT LEAKING IN HEAD

Discussion in 'Traditional Hot Rods' started by clockwork31, Apr 26, 2025.

  1. clockwork31
    Joined: Sep 28, 2010
    Posts: 445

    clockwork31
    Member

    Hi, I tried the search option first but I'm not sure how to describe or what term I should use so Il give it a try here, as you can see in my pictures there is coolant in a place where it is not suppose to... I changed my heads (camel humps) about 2 years ago cause they were cracked. I bought a new set of head machined and tested and I re-installed everything. I noticed after a couple of run a thin "line" of coolant at the bottom of driver side cylinder head after I removed the valve cover, I left it that way since winter was coming and it was put down to rest for about a year. Now that I opened the valve cover yesterday I found a good amount of coolant in the head as you can see, also the coolant from radiator "top reservoir" empty which I found in the oil pan after dropping the oil (very green and transparent and seperated from oil), my guess is it slowly leaked from the top to the pan by gravity by passing through the head and followed the path to the oil pan by the hole completely at the end of the head just to the right of the last rocker near the firewall where you see the coolant to the right just flush with the "dripping hole" or "oil passage". Could this be a distorted intake manifold or faulty gasket and/or rtv void?? Im very sorry if my terms are not accurate. I do my best! Thanks for your help.
     

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  2. ironandsteele
    Joined: Apr 25, 2006
    Posts: 6,097

    ironandsteele
    Member

    Did you use RTV or any kind of thread sealant on the head bolts when you installed the heads?






    politicstshirt.JPG
    ironandsteele.com​
     
  3. the oil soup
    Joined: May 19, 2013
    Posts: 301

    the oil soup
    Member
    from Tucson,AZ

    Did you make the overflow tank? I like!
     
    clockwork31 likes this.
  4. clockwork31
    Joined: Sep 28, 2010
    Posts: 445

    clockwork31
    Member

    Yes I did but its been 2 years, not sure which one though I gotta check, I think it said aviation grade or something like that on it from Permatex, you think it could be from the bolt threads and what rtv would you use?
     
  5. clockwork31
    Joined: Sep 28, 2010
    Posts: 445

    clockwork31
    Member

    Haha yes, thanks!
     

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  6. 4barrel Harold
    Joined: Aug 23, 2018
    Posts: 11

    4barrel Harold

    Pull the plugs and let sit over night. Spin it over and coolant will blow. If no coolant it's the intake gasket. Loosen the oil drain plug to remove the water in the pan before turning over. I would use cork or rtv on the ends if block or heads have been milled. I never used anything but oil on iron heads for the bolt threads since the 60's. I still have my first Sears Craftsman torque wrench from 1961. What year are the heads? Is the bolt hole in the rear of the head factory? 1968-69 up? Is the bolt is too long and over tightened? Maybe check the head bolt torque.
     
    Last edited: May 2, 2025
    49ratfink and Hot Rods Ta Hell like this.
  7. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 3,243

    19Eddy30
    Member
    from VA

    Maybe crack in one of the outer set of
    rocker arm studs ,
    Snake Oil repair , Blue Devil or other
    Commercial coolant stop leak
     

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