Ok. This is what I have come up with so far on how to test whether a particular lifter is good or bad.
1)If the lifter is solid/stuck - Dismantle and clean all the parts of the lifter and put it back together. Dip in oil and pump the top plunger two three times. If the lifter is good then it should go solid with no squishy movement. If still squishy after pumping dipped in oil then it's bad.
2)If the lifter is squishy - Dip in oil and pump the top plunger two three times. If the lifter is good then it should go solid with no squishy movement. If still squishy after pumping dipped in oil then it's bad.
3)Also check the lifter crown to ensure it is slightly convex. If it's flat, then the lifter needs replacing.
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