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Discussion Starter #1
Hey, so I have no idea what this hole is on my '68 manifold. There was a set screw in it and recently the screw got blown out while driving. Does anyone know exactly what the hole is and what size of set screw I will need to replace it with? Here is a picture:

 

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That's much larger than the stock 68 hole. It should be 1/4". The tube for the hot air choke should be inserted there.
 

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Discussion Starter #4
I know its not the hot air choke because that is located just beyond the scope of the image on the right. Either way, the thing produces an awful sound as you can imagine so I need to jump on that damn set screw as soon as I can - perhaps weld on a bead just to hold it in. Looks like a 5/8" hole which is screwy as all get-up.
 
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