Cam specs are cam specs, right? Wrong! The guys show you how three seemingly identical cams can behave very differently. It's called cam-lobe intensity, and it's all about the shape of the lobe between the base circle and the nose. So what's the difference between a standard, a high-intensity, and a low-shock cam? Which one is right for you?

This one's all about how the length of header primary tubes can affect the power curve. The guys explore all the different ways an engine expels its exhaust -- mainly the negative pressure wave that pulls burnt gases from the cylinder, how that changes how much torque is made, and where the power occurs.