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post #1 of 3 (permalink) Old 05-23-2017, 01:26 PM Thread Starter
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PB Vacuum Fitting

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):

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post #2 of 3 (permalink) Old 05-23-2017, 01:43 PM
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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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post #3 of 3 (permalink) Old 05-23-2017, 01:56 PM
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1/8 inch NPT (pipe) thread
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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