What's this hole in my intake manifold for?

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Engine is a 1973 1F. What's this hole for?

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That's for a thru bolt that attaches to the stock exhaust manifold. It's fine as is. Does not connect to inside of intake.
 
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That's for a thru bolt that attaches to the stock exhaust manifold. It's fine as is. Does not connect to inside of intake.
X2
 

Pighead

Stop calling it an FJ
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Shouldn't I plug it so it doesn't affect intake vacuum?
That hole does not communicate with the interior of the intake manifold, it has no affect on vacuum.
Put a bolt thru it if you don't like looking at an empty hole.
 

ToyotaMatt

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it's for this :




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