Hydraulic lifter problem.

Lol
When I put my 340 together with a Comp xe268h
Most if not all the lifters were noisy at first start up
For a couple of seconds until there was oil pressure.
And after shutting if off , then starting
it would rattle all over again.
I pulled off the valve covers and watched the valves slowly close that were open!
I called Comp to ask them about it
The guy said what do you care if it rattles when you start it?!
I guess they had a lot of people complaining...lol
Anyway I replaced them with a new set from a mopar performance cam I've had since 1990
They have never once bled down and rattled like the Comps.
The xe cam is noisy on it's own but that's a whole different issue...
Next cam will be a solid flat..
My 2 cents