small block cam issues...rattley new engine!

pushrods were a thought, but talking to a Roller Rocker manufacturer it was dismissed!! Still think that is the most lightly cause!

Pushrods to short/geometry off.
Rumble Fish is SPOT ON here.... BEEN HERE,DONE THAT...Ignore what the hungey salesmen tell you, do the research yourself.. You will come out,better for it ....