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Being new to snails when I got mine I asked people what the side hole that was plugged was for. Got a lot of off the cuff answers. Mostly people said it had to do with casting the piece / manufacture. Now for the first time I see someone has plumbed to this hole. So - what gives. What's the deal? Was hoping some of the old timers might have some information. Thanks!

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My snails do not have that casting in them, I believe they were part of a casting process for some manufacturers, I would think that having that water high like that you could pump water back into your header.. no sure but have not seen them set up like this before.
 

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Side hole on a snail , for casting cores

When you cast any part and need a hole or passages, (water, oil, air,) you can start with a solid casting and drill / mill out the passages to size, not always $$ practical. If you want a hollow casting where there are water passages inside the casting, you make a mold or pattern for a "core". This core is typically made from the same sand used to cast the part but held together with some form of binder, or epoxy. This core must be supported inside the cavity of the mold for the finished part. When the mold for your snailes was made there was a small dowels partruding from it to hold the core in place while the aluminum is poured into the mold.

After the aluminum hardens and cools the part is removed from the mold the core must be removed. anything from vibrators, to chisels, or sand blasting to clean the inside passages. once the core material is out these holes must be plugged. using freeze plugs just like the ones on all cast engine blocks, heads, intake manifolds, these openings can be threaded like on the bottom of the snailes (yes these are core locating locations).

Remember even the cylinder bores are formed with cores, lifter valley ect.

I used to cast things at home. :yes:

Sand cast core.jpg 2 core casting.jpg
 
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