Looking to build massive biceps, then pick up the straight bar barbell. Grab the bar with a shoulder width under hand grip, keep your elbows to side, raise bar as high as you can without letting your elbows leaves your sides. This usually is when your hands reach the same height as your shoulders.
No disrespect toward Kevin, but working with free weights, greatest resistive forces are offered to muscles (biceps in this case) when load moves parallel to gravity. When you let your elbows leave your sides in order to lift the bar to your chin, you begin to move perpendicular to gravity and you are actually disengaging the biceps and engage your deltoids.
Lower the bar as close as to full extension as possible. You cannot fully extend the arm since the bar will hit your thighs
