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THe line goes from the back fire valve to the intake manifold. I've been checking different mustang places with no luck. Seems they have every line except what I need. I starting to think I may have to make/adapt something.
the picture above is for a check valve, not the anti-backfire valve, again the line is approx 3/16" ia. has a bushing? on one end that screws in the valve and then connects to a "mini" 2 port manifold via rubber tubing which is screwed into the main intake manifold