Noisey lifter at startup???

Just installed new Aluminum heads, cam, lifters & roller rockers and I have one or two noisey lifters on cold startup! Not real bad, at all. You can just hear an individual lifter or two above the rest. After a few minutes the lifters quiet down. The whole valve trains seems much noiser since I did the parts change over, but not like it's coming apart. It runs like gangbusters, so it can't be too far off! I must have picked 100 h.p. because there's a world of difference.

Any ideas? My only guess is that the roller rocker adjustment a little tight causing it to have to pump up after it sits awhile. That's my only guess!

Could aluminum heads, a little higher lift cam, roller rockers and steel valve covers cause enough more valve train noise as compared to my old stock steel heads and cast aluminum valve covers to be part of what I'm hearing??



Ideas??? Feel free to tell me I worry too much!