How quickly this got on a "crap gasoline" bashing thread. Facts are often left by the wayside.

Here are some facts:

In metric units from Engineering toolbox I got thermal conductivity of the two metals in question. Holley carbs until recently were always zinc die castings, the Aluminum Four Barrel aka AFB plus other Carter lookalikes including Edelbrock are aluminum.

Zinc - 116
Aluminum - 205

That's right. I don't care what gas you use, aluminum conducts heat almost twice as well as zinc. Meaning the fuel in the aluminum carb will get hotter.

WHY do you suppose Carter made the Thermoquad body out of plastic? I am certain that one of the reasons was cutting down heat to the fuel. That was one of the advertising claims, they made a big deal about it. They had probably really been hit with this as the EPA started cutting down on emissions from evaporating gasoline.

I could get started on the amount of ignorance showing in this thread, but why bother? Anyone else know what Reid Vapor Pressure is?

Much easier to bash.

R.