Sorry for the late reply. I thought this thread got deleted or something. Anyway I’ll try to reply everyone and post some pictures:
[quote]The Mighty Stu wrote:
4 years time is considerable, but also, we don’t know where you started. For someone who started at 14" arms, packing an extra 2.5 is nothing to sneeze at, especially if it’s lean gains. Considering you haven’t made recent noticeable progress, I would agree that something new might be in order.
I know a lot of people get great results from having an ‘arm’ training day (bis and tris togther), but in all my years of liftingI never took that approach myself. In MY opinion, and this doesn’t mean other methods won’t work, I made decent gains by focusing solely on trashing one muscle, and not concerning myself with the awesome pump you may get by hitting antagonists in the same session, which while blood flow is great (nutrient delivery, fascia stretching etc), it doesn’t always guarantee that you’ve stimulated a growth response.
Have you always had an arm day, or have you ever made use of throwing in the smaller arm muscles after larger muscle groups? I always liked hitting biceps after back for example. The biceps were already warmed up and worked to some degree, and then I’d target them specifically with additional exercise selections. This may not be the final, amazing, ground breaking solution you’re looking for, but if you’ve never made use of this common bodypart split, it may just be.
S
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I started at ~170lbs. Not fat but not a tight belly either. I did not measure my arms before I started obviously but here’s a picture of how I looked before I started. I cut out the rest of the picture as it’s of no use here 

To answer your question on a specific arm day; this has just been something of the recent year. I used to do biceps after back and triceps after either shoulders or chest. In any case they haven’t taken a growth spurt on either approach.
[quote]gregron wrote:
OP, if your biceps and triceps aren’t growing (noticeably) then why are you hitting forearms first on your arm day? Do you think that prefatiguing your forearms/grip is hindering your biceps/triceps training?
Increase your frequency. Try keeping your arm day but throwing in a few extra sets of triceps on chest day and biceps on back day. That could help.[/quote]
The forearm thing has just been something of recent. It is hardly fatiguing, my workout after that does not suffer. I have already increased frequency on numerous times.
[quote]Depression Boy wrote:
Some pictures would help. Seriously. A lean (i assume) 230 pounds at 5’11 but rocking 16.5 in arms flexed (I assume)?
And since strength-wise everything is going “great” just how great? Numbers on bench, squat, weighted chins, dips, BB row, standing curl?
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Well I might have to rephrase “going great”. What I mean on this is that my strength is still rising on arm work (and other groups too)
Here are a few “max” numbers on the exercices I do often. I convered them from KG:
CGBP: 264 lbs
Bar dips: Bodyweight + 100 lbs
Squat: 440 lbs
Deadlift: 507 lbs
DB press: 121 lbs
Shoulder db press: 101 lbs
DB curl: 52 lbs
I am limited to what pictures I have here at the moment so here are a few:
Overall

I know I don’t look 230 but the scales don’t lie I guess. A lot of weight is is in the wheels so just let the weight thing slide if you will
Bodyfat is just a guess based off what I looked like at 9-10% last summer. All pictures above were made in the evening where I’m 500g+ carbs heavier and I tend to bloat up pretty easy. I have a decent six pack when I wake up for what it’s worth.
Oh and chest is lacking too I know but this is actually growing good since I started focussing more on fly exercises instead of pushing the weight on compounds.