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I am nearly the end (knock on wallet) of my LT1 swap and am working on the Fuel lines. I want to do them in -6AN fittings. I figured out all the parts I need except the ones that will help me fit the braded steel lines with the stock steel lines that are stock on the car. (its 81 so it already has a return line) anyone have experience with AN fittings? I just did the tranny lines in braided steel and it came out great (pics as soon as I find my camera.
I am doing something similar to your setup. I am using the 3/8 fuel line as a return line for my setup. There are AN fitting that use a compression fitting on the steel line that go to an AN fitting. The 6 AN is an easy line to make up this way with a 3/8 line.
Some work with aluminum some work with steel. You just have to get the correct one. I went with Russell fittings but the others probably have the same type.