Digital BW, The Print

Hi,

I'm using the Epson 1280, UT-2 inks from MIS and Roark's workflow to 
print Black and Whites.

With this setup/workflow, is the Black ink position even used when printing?

I ask for two reasons..

1) if not, then I won't waste money on a bottle of black ink for 
refilling, since my printer will be dedicated to this setup/workflow for 
the foreseeable future

2) i have a clog in my black ink position that I can't get rid of for 
the life of me... if it's not being used, I'll just leave it alone.

Thanks,

Mike