Strange clank noise

[Tom Leppke-Hennig]

<<This is kind of odd.
After a complete rebuild on a '86 5000CSTQ, finally
got the engine running and while it is idling, I hear
a strange clank noise coming from towards the rear of
the engine...>>

Did you install all-new lifters? I have had those take an unusually long time to settle in.
There are supposedly some tricks to do on the bench before putting them in, to minimize this
effect, but I have never done it. I just idle  the new engine long enough for it to go away.
Sometimes it takes a silly long time, like 45 minutes.

Tom LH
1995 90q