This fall I got my 455 running and only got about 150 miles from it before the cam went bad. The 2 lobes that went bad, went so quickly that it wiped out my bearings, all of them. Some bearings had grooves worn in them a little less than 1/16" X 1/16" all the way around. I first thought I had a problem when I noticed the intake rocker on the #8 and #3 piston would not stay adjusted and I had bearing pieces about the size you are speaking of in my oil filter both times I changed it after the break in. Some other pieces were more like the size and shape of the ball from a ball point pen maybe a little smaller. Those two lobes were ground completely gone and the lifter was concave and grinding on the shaft of the cam. Just watch very closely what the oil is telling you and check the rockers for noise and adjustment often. I don't think you can change the oil too much. My oil pressure was very erratic as well. sometimes below 15 psi and sometimes above 80 psi. Watch for things you feel are abnornal, if you notice something you don't feel is right then post it and these great PY guys will help you narrow it down if it is an issue. Good luck and keep us posted.
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Semper Fidelis
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