4.8 ls ticking noise help

[OKGMC4]

Originally Posted by homemade87

This is correct about the o-ring being a problem . It can crack or be pinched and aerate the oil and cause the lifters to tick or if bad enough cause a knock at start up .

No need to remove the the pump for a basic cam swap on a ls engine if not having problems . But if replacing the pump or chain , best to take care and pay close attention the the o-ring when installing .

Sorry. On both of mine I put in a new timing set and went through the whole mess. You are right. Technically speaking no need to pull the pump for cam only.