What's the difference between single and dual overhead cam engines?

Ever wondered what people are talking about when they say "dual overhead cam"? Don't worry, because we're here to explain it ...
Motor Trend

Ford Performance Racing Parts and Performance Assembly Solutions Are Out to Change Your Perception About Crate Engines, and Here’s Why

For as long as there have been mass production engine rebuilders there has been skepticism about quality and a trail of tears to go with puddles of oil. We’ve all been there one time or another. Need ...