Gerard,
That pipe is the carb overflow, for when the float sticks - which it will.
Usually carefully aligned to poor neat fuel onto a hot exhaust manifold, but
then the engine does come from doubtfull parentage!
Guy
>
> The one thing I haven't been able to figure out is where the 1/4 or 3/8
> inch vacuum connection on bottom-manifold side of the carb goes. This is a
> brass pipe that is angle down and toward the front of the car. Is that a
> purge line? For now I just capped it, but if anyone knows please tell me.
I
> can't seem to find any reference to it in the manuals.
>
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