I have never found "tremendous torque" in a Vacuum advance. In fact, I've really never found any more power by feel and all my cars are street cars. Regardless if stock or a built small block, I've not found it. Some claim 1 mpg on fuel, but I've not sought fuel mileage so badly on my classics to hunt for that last mpg. I'm sure it helps because the factory spent the $$ to put them on the cars. Tremendous amount of torque would be like, 40 ft lbs or 60 ft lbs of torque difference ???
