Ok, after loging in I was finally able to see the pictures. The holes are smaller than I thought. How far in should I be able to stick in a pipe cleaner? Can I just use a soft wire? or blow high pressure air into the hole.
I like to use a pipe cleaner, as it will pickup any sludge on the way out. It should go in deep enough to touch the crankshaft, which is I'd guess about 4 or 5 inches. It'll be a solid stop when you hit the crankshaft journal.