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I am changing over to braided nylon lines and can not determine what size it is
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If you are talking about the metal lines on the fuel feed lines to the spider, I have only ever seen M16x1.50 on the feed and M14x1.50 on the return. They are of course Saginaw Power Steering fittings with an o'ring and the fuel line is male thread going into the female threads on the hard lines going into the spider. If there is another option, I have not run across it in ~20 Vortec powered Trucks, SUVs and Vans.