2017 V8 Caprice
After having all lifters & cam replaced, two rocker arms have failed, one shortly after the other. Mechanic is going to install a trunion upgrade kit.
Just after the lifters & cam were done, it was running very quietly - even when stone cold.
Is it possible something was done incorrectly to cause this problem?
Btw, this is the second time the head has been off - first time was circa 100K ago, when *only* the lifters were replaced.
Note also: a high flow oil pump was fitted this second time. (he wants to increase oil pressure at low revs)