What is acceptable in the filter when you cut it open? My 436 sbc has 3 oil changes and 2000 miles on it now and I'm still getting little stuff in filter. It's not magnetic and its not much maybe a little piece of alluminum dibris here and there. Motor previously ate a alluminum Timing cover and rod bearing and was washed out pretty good but you never can trust they got it completly clean. This oil change has 500 street miles on it with some out in the middle of nowhere testing. A little paranoid because its my first big inch sbc. What do you think??