SBC intake manifold question.

69427

The Artist formerly known as Turbo84
Joined
Mar 30, 2008
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Clinging to my guns and religion in KCMO.
Help a BB guy out here, please. On several sbc intake manifolds I see a couple vertical threaded holes (3/8" thread) on the center left side of the manifold. I'm drawing a blank regarding the reason they're there. Anybody have an answer for me?

Thanks,
Mike
 
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