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I would guess it's because the threads were cut to deep, you could wrap more pipe tape around the threads and try that, but if it's not leaking, don't worry about it.
 

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the reason the pickup is so deep is to pick up liquid coolant for the heater instead of coolant with air bubbles that live on the top side of the coolant system---especially on origionaltype cars w/o an overflow system---with a 16 lb cap and a functional o'flow system , you could probably get by with a regular elbow
doctordesoto
 

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So I guess you were talking about the depth of the pick up and not how far it screwed in. My bad!
 
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