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Per what I wrote earlier, you need to move the valve up and down to remove whatever varnish is on the valve stem. If you are moving the valve, the compressed air will not hold. I hope you can understand that! With the piston at TDC, the valve can only drop a quarter inch or so. So, you can still grab the valve stem to pull the valve back up. Without the piston on TDC, where will that valve go to without the compressed air?
Mariner Blue: contact me off-forum for more details.
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Fordman
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