http://www.burntlatke.com/bb.html took me 1min of searching in google kyle you have a habbit of doing this, next time just remember to search first....the burnt latke link there has step-by step instructions on how to build it.
it tells you on the how-to though and what to drill bit to use i recall.
and the reason ive done this to 3 of your questions is because they are all topics answered in other posts that take 2min to find on this forum.and you made 4 topics all on pistons on the same day,why didnt you just make one topic with 4 questions?
Quote from that link i gave you:
"The BB exit hole can be drilled at 3/16" (.1875) or similar. This hole is tougher to align as the sides of the block are not parallel. Use shims, guidelines and maybe a square (CD cover) to get this hole exactly right. Both entry and exit holes should form a smooth tangent from the vortex hole with no bumps or dips."
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