If you install a cam, you need a cam gear to install it. This is more true for a DOHC than a SOHC though. Take into account that the second that cam is on, you should be dialing it in. However, because it's a SOHC engine, the intake and exhaust events will always happen at a set gap no matter what degree you dial in. Because of this, when dialing in the cam, you will notice that the more advanced you are, the more torque you have, but will in turn lose top end because both intake and exhaust events will be advanced at the same exact degree. The more retarded you go, you will notice the more top end you will gain, but you will lose bottom end. This is where you decide what is your preference since you will be trading hp for torque or torque for hp.