My 340 build

From the valley area, it will very likely wash to the pan, unless it gets stuck in some corner of the valley. It may sit there or get washed to the screen. If the pickup screen mesh is smaller than the chunk, it will stay in the pan. If the chunk is small enough to get past the screen, the 1st thing it gets to is the oil pump.... where it will do no good and get mashed into particles. Then it gets to the filter.

Perhaps pull the pan and check there? Any chance it went down an intake port? Reminds me of my missing a bolt and never finding it.... it hid behind an intake valve stem and I never saw it in there. Not a good outcome. So this small missing AL particle is some degree of risk.