88' C1500, 305 TBI, TH400, 170,XXX miles.
Lifters were noisy as all hell the first 5 or so cold starts after an oil
change. Lifter noise would only go away if the truck was physically shut
off and then restarted. After the first 5 starts lifters were perfectly
quiet. The issue presented itself only after switching from Mobil 1 to AC
Delco oil filters.
Changed the oil a few days back and used a Purolator PureOne filter.
Absolutely ZERO lifter noise after the first two cold starts. So, what I
have is a GMC that doesn't like Delco filters..................he he he he.
Thought those who responded to the OP might be