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Often these threaded bosses serve a purpose in the factory, on the assembly line. Typically, lines and robots will lift and carry via connecting to a boss such as this.

Can't say for certain that's the reason for this particular one, but it's a hunch. You'll find a few of these around your 310 engine, and on many engines.

As for leaving them open, BMW sees no concern.
 

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Discussion Starter · #6 ·
Often these threaded bosses serve a purpose in the factory, on the assembly line. Typically, lines and robots will lift and carry via connecting to a boss such as this.

Can't say for certain that's the reason for this particular one, but it's a hunch. You'll find a few of these around your 310 engine, and on many engines.

As for leaving them open, BMW sees no concern.
Thanks, you're probably correct.. as Hasselman said above, probably a cost saving exercise not blanking it off.
 
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