I only do two exercises for my biceps and my arms have grown from 13.75 inch to 15 in about 10 weeks

Exercise 1:

incline bicep curls

using a bench (on an incline) lie back with your arms dangling by your sides. This puts your biceps in their weakest position (apparently). Try to twist your arms outwards as this puts the strain on the biceps rather than the forearms. I just do 6 sets of 8/10/12 depending on the weight used. Just make sure your increasing the weight/rep amount everytime you train if possible. You'l definately feel in the bicep area a day later or so but that's likely to be because you have worked the muscle properly and fully.

Exercise 2:

Hammer curls

work the forearms more than anything i think and the point between your biceps and your forearms....which is crucial to overall arm development.

I'm an ecto and they work for me. I have a bowl of tuna and a tall glass of lucozade after my workout....followed by a meal an hour later.