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The bearing failing would cause the rod to jerk up and down on the crank, Wich sounds like what I am hearing. in the case of an SR its hard to pinpoint knocks cause the sound echo's through the aluminum. When diagnosing a knocking sound in an SR I pop the valve cover off and check the lifters, and the timing chain guide. (I just take it out) IDK how the timing chains are on a Z but I would check that too, I also know that cam sprockets tend to cause knocking sounds. does your motor shake at all wail the knocking is happening? like its off balance? and SR's have the coil pack cover thats why I said pull the injector lolz.
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