question on phenolic spacers

I just read an article by a man who does intakes that the phenolic spacers do cool the carburetor for a denser charge and does cool the fuel as well. The open spacers add high rpm horsepower and take away low end torque and mid range torque therefore open spacers are better suited to be ran on single plane manifolds. The 4 hole phenolic spacers increase low end and mid range torque by allowing my air to come thru the intake and it also allows the fuel to burn evenly in the intake.
Thats not what it said word for word but in a nut shell thats what it said about the phenolic carb spacers.