There is no down side to having big triceps, none. If you have big slabs of meat hanging over your elbow your probably moving in the right direction. You need big triceps for a strong bench, overhead press, and to offset your most likely over developed biceps.
Thankfully Molly Edwards comes to the rescue. This triset involves: neutral grip pushdowns, seated dip machine, and banded overhead extensions.
[youtube=https://www.youtube.com/watch?v=3KHTu2eco4E]
Perform all exercises for 12-15 reps and run through the circuit 2-4 times. This should certainly produce an enjoyable tricep pump. Add this to your assistance work two or three times a week to really pack some mass on.
You need bands for the overhead extension and can certainly use bands to replicate the neutral grip pushdown as well.