I think mine was the intake on four.
1/4"
Metal floating around is generally a bad thing. Any thing short of tearing it apart and tanking it is probably a risk.
With that said, I looked at it carefully and decided to flush the thing out. Worked fine and it has been about 4000 miles so far. I did flush the whole system quite a bit, changed
oil and filter before during and after the flushing and initial break in and then again in about 300 miles. Used a magnetic drain plug and cut each of the filters open. After the initial break in things have been metal free. Obviously this was not the ultimate choice but it has worked OK. Oh, and don't flush the motor with your new lifters in it!
Rick