I have found that the collapsed lifter situation rarely makes any noise. In my case cylinder #6 just stopped working and the pushrod bent falling out of the lifters way. We stoipped the engine almost ...

Parts Man1 —– wrong – not rare camshafts happens in about 50% of the failures. remember GM under powertrain only replaces 1 bank of lifters (8) not all 16 as every engine builder has been taught to ...