Unless I'm disoriented, looks like the vacuum line off the brake booster


The brake booster line is to the right of the tubes in question and the vacuum tube turns upward behind (car forward) the e-brake bracket. The vacuum hose can be seen above the e-brake bracket. The other two tubes appear to be copper.

For later cars, in addition to the vacuum line, there is ONE line that is supposed to connect the top of the rad to the swirl tank. This was meant to allow air to escape from the top of the rad.

The lines shown in the picture appear to be larger than that line.

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