I learned it like this... Camshafts with tighter LSA numbers like a 106 or 108 are used when you want a tighter, narrow powerband, where peak torque occurs earlier in the powerband. A good example of an application for this would be a circle track car that needs to drive off the corner as quickly as possible. Generally speaking the tighter the LSA is, the peakier the powerband and torque curve will be. Wider LSA's, like 122 -116 degrees will result in a flatter torque curve, with peak torque occuring at a higher RPM. They also have a much smoother idle, and are good for engines using some form of boost. Lots of times a pro stock car will use a wider LSA cam to help control traction early in the run.
