With the 5*5 program I know it seems like your not hitting your arms much, but in all honesty when your doing your rows your biceps are getting a good workout. And when you doing your Presses your Triceps are getting a good workout.

So by targeting your arms on Friday with 8 sets (tri's) 6-8 (bic's). That is plenty. I did this program too and my arms grew about 1/2 " in 8 weeks. I think that's a fair gain in little time. Yours might grow more, I don't know.
I do know that they are a small muscle so you may have been over training them in the past which can result in a standstill or even worst a loss in size.

Just stick to the program, have some patience and you will see improvements ( at least others around you will).

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