before the axle turn downs

abdywgn said

was that the valve on their turbocharger?

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No I think it was a cold-side device that allowed the carb to feed directly to the intake before boost came up and shut it off, forcing the carb to be pressurized. Not sure. That memory is from the 70s so it might not be accurate. I remember almost exactly what it looked like but a google search yielded nada.
It was a spring loaded football-shaped slug, set into a tube, that boost pressure would blow off the seat and then flow around , on it's way to the engine. I think it was on a blow-thru, but not sure.