'Back when' we ran 2 tubes from the fuel tank, one went to the carb and the other was left open.
Now we have that 2nd tube going to the muffler pressure tap.
The Medallion engines had a tap you could drill out on the side of the crankcase, but I haven't ever seen Medallions run using this tap. I also have an old backplate for TD/Medallion with a presure tap in it. Is there a difference between using the crankcase tap or the backplate tap?

Is using crankcase pressure on a sport engine mainly for better idle?

If there's an article on line about this, I'd like to read it.

Beeza