1973 Chevy 350 need help diagnosing compression readings
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Thread: 1973 Chevy 350 need help diagnosing compression readings

  1. #1
    Junior Member

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    Nov 2017
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    1973 Chevy 350 need help diagnosing compression readings

    Does anyone know why the needle on a compression tester would bounce between a normal max reading (125 psi) then to zero and do this constantly as the engine is cranked? The tester/gauge is good because I have other cylinders that read exactly as they should ("pump" up to max as engine cranks). I've done quite a bit of searching for an answer to this symptom but nothing so far. Any help would be appreciated.

    Thanks,
    Bob

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  3. #2
    Blow by, valve issues, leaky connection into the head...just to start....does the engine run?

  4. #3
    Junior Member

    Join Date
    Nov 2017
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    Yes, it does run and only seems to have a slight missing. This engine was running perfectly except for a tapping noise coming from the passenger side head. This was going to be a simple valve adjustment. I have it now that while the engine is running I can loosen the rocker arm nut until the "clacking" starts then tighten until it just stops then add 1/2 turn more. I have 3 cylinders giving me the strange bouncing from max to zero. Could something like this be cause by valve adjustment?

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