Dual Feed Fuel Line Setup
I wish someone made a non-chromed dual feed holley line with a port .
Just a really well made functional one .
Yup. Used to be non-chromed ones at every store. Now pretty much unobtainable.
One advantage of chrome is it that it minimizes radiant heat absorbed.
@KOZ45
For what you are doing - steel line is best.
The flexible ones can be handy when swapping jets at the track, but they all have issues that usually outweight that slight advantage.
Fitting sizes. Again for what you are doing, 5/16 lines up the carb has advantages. One is that they have more room to put both wrenches on when installing and removing. 5/16 line to each bowl is plenty large enough that even at wide open throttle there will be plenty of fuel available to refill the bowls. That is, unless this is sitting on an engine which will be putting out more than 400 hp.
If you've already committed to 3/8 lines and fittings, that's OK. Just know they are occassionally a PIA.
For NPT threads on the fuel system (or cooling that matter) my suggestion is a small amount of specialty pipe thread sealant from Locktite.
