That’s the fuel tank vent line, in 71’ it was connected to the crankcase breather cap on the right valve cover. A larger hose from the carb bowl vent valve would have it’s own nipple on the breather cap as well.


1972 Road Runner GTX 440 6bbl 5-speed
[img]http://72rrgtx.com/carpics/bucket/DSC06730r-1.jpg[/img]