g'day people, i have two oil feed/return holes in the block between number 1 and number 2 cylinders that were blocked with gunk, was able to clean them out with a small drill bit by hand,blew air through all the other one's in the block, can hear the air going all the way into the block which is normal, the two between cylinders 1 and 2 is only blowing air out the other hole and not into the gut's of the block like all the other ones are, any idea on how i can clear it out without dropping the sump ??? any help would be great.