just looking at what needs to be done to my block, so i thought i'd post some shots.
these before and after pics are of three different blocks when i was deburring the oil galleries.
oil galleries before
a die grinder from supercheap and some burrs and stones from bunnings. about $55 all up and you're away. also good for port matching.
these have done 3 blocks so far, with a lot of life left in them.