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I need to order something like this for my new SMI Q-jet whenever it arrives. Does anyone know the NPT size for this Power Brake fitting where it goes in the back of the (Olds) Q-jet?

Here's a pic from Ames catalog (N139PV):


Thanks:thumbsup:
 

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If you have a day or two, I could measure an original. They are fine thread, & being cast out of pot metal, these fittings often break off right at the top of the threaded area. PartsPlace repopped them several years ago & catalogue sellers offer several different versions. The one that is Y shaped is correct for '68-71 4bbl Pontiacs with factory AC.
 
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