I know our stock hydraulic lifters are very delicate and precise part.
What could be reason when stock lifter can go bad?
Conditions
Stock Rev limier;
5K Oil change.
LT4 RR and Valve springs.
Stock Cam
BTW car is 96TA MN6 with 75K

 

what do you mean go bad?
I had a small metal filing get on one of my lifters, so it wore it down and one of the cam lobes. maybe same thing?

 

Its start making deal cylinder sound or bad lifter/Rocker Arm. ARE gonna look at on 3rd of next month