Compression test fustration

General Mopar Tech Discussions

  1. Davidrad

    Davidrad Active Member

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    I have a 67 belvedere with a 383 and the HP exhaust manifolds. How the frick do I manage to get a compression tester into the spark plug holes. Do you have a recommendation on testers that allow for almost 0 clearance and can be done blind since the manifold is in the way. My testers all have about 8 inches of hose connected. Basically I need a fitting that threads in to the spark if holes and then I can connect a qd to.
     
  2. Kern Dog

    Kern Dog FBBO Gold Member FBBO Gold Member

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    Every tester that I have seen uses a black hose with a brass or steel threaded fitting at one end and a quick disconnect for the gauge at the other end.
     
  3. BB BELLA

    BB BELLA Well-Known Member

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    as kern dog stated the black hose with fitting on the end is smaller and more pliable than anything else your going to come up with! It's definately a 2 handed job, maybe use the phone a friend option if your not ambidextrous! consider yourself lucky your not trying to do it on a side by side marine engine setup,standing on your head!
     
  4. 69L48Z27

    69L48Z27 Well-Known Member

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    I’ve found working from under the car helps being able to see the plug holes. The right bank is challenging, also try standing in front of the car and reaching back under the manifolds, I can get to the first three plugs that way.
     
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    • Bee1971

      Bee1971 Well-Known Member

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      Top or Bottom

      Bottom is best by far
       
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      • Davidrad

        Davidrad Active Member

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        I had exhaust leaks anyway so I just took the HP manifolds off. Life got much easier then. But the test didn't give me good news.

        MVIMG_20191104_212145.jpg
         
      • Fran Blacker

        Fran Blacker FBBO Gold Member FBBO Gold Member

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        Think KD meant a tester that screws into spark plug hole.
         
      • Don Frelier

        Don Frelier FBBO Gold Member FBBO Gold Member

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        Put some oil in #5 and test again. If it stays low you may be able to get away with re-working the heads.
        If it comes up...
        Well then you are in for a rebuild.
         
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        • BSB67

          BSB67 Well-Known Member

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          Unfortunate. The "better" numbers are bad, and the bad number is worse.
           
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          • Davidrad

            Davidrad Active Member

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            I forgot to say. I did the oil trick and it didn't come up. I'll be removing the heads once I get back in town and taking them to a shop. Or buying a cheap 440 on CL and taking my chances. Can't go wrong with more displacement.
             
          • Davidrad

            Davidrad Active Member

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            Agreed. Pretty sure the valves have sunken into the head.it does explain why it didn't pull very hard.
             
          • dadsbee

            dadsbee FBBO Gold Member FBBO Gold Member

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            I do it all the time.. but I'd have to explain what XX/80 determines most likely.. summer2018 438.JPG
             
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