Chnged my oil today and noticed the shavings.Most of it was a fine metallic like dust built up on thedrain plug.Had a couple of larger sliver type pieces that looked almost like they might be thread from a bolt.Engine has about 14,000 miles on it,new gm block.Oil is getting up to the top of the heads to rockers and all.Any ideas,it`s got me a little worried.I had a set of cat stainless stell rocker arms that the needle bearings went out in them somehow and I`m wondering if it may be left from the needle bearings.