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Thread: 71 gs 455 engine knock

  1. #11
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    I'd certainly start with pulling the left valve cover, then wiggling (vertically and horizontally) the individual rockers when they are in a valve-closed position - there shouldn't be much movement at all. if there is, that's the first lifter I'd tap on to try to unstick.

  2. #12
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    71455
    to make things a bit easier; let's say the 455 fires 12 degrees before TDC, - that's when both valves would be closed, do your test on the valve springs by rotating the engine, using the rotor to determine each cylinder's firing point. then you can go back and forth making sure both the intake and exhaust valve were opening - they should each move about 1/2", and not hit the top of the piston.
    Butch

  3. #13
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    thanks guys!

  4. #14
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    let us know (with pictures if possible) of what you find

  5. #15
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    I will for sure! it might be awhile but i will. it will be within the next 3 months.

  6. #16
    yingxuy Guest
    Remove the valve cover, start the engine, watch each rocket ARM / valve to see if they are all opening and closing ceremonies. Watch each channel if the future price of oil. I blow out the air compressor.

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