Hey, I don't think that would be lifter noise. Just for the simple reason that if you unplug the spark plug the lifters are still getting hydraulic pressure to them, regardless. So it sounds like you might have rod bearings, wrist pin, etc. Don't know if this helped but here you go anyways. Once you take away the energy from the plug it can't fire no more, right?! Right. So thus your taking energy away from the combustion chamber. Taking pressure off of the piston and further down.
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