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Now I understand, thanks for the detailed explanation

Nope, you were close, not more junk but bigger junk :D

skiberger,
Can you re-explain in lay man's terms
Thanks

the header is 13"
from the top of header to bottom of trusses is 8"

if I get rid of the header, don't touch the 2 horizontal 2x4's, I should be able to p/u at least 13", assuming a 5" steel beam...

http://www.awedio.com/sdc/IMG_0884 (Custom).JPG

http://www.awedio.com/sdc/IMG_0891 (Custom).JPG

http://www.awedio.com/sdc/IMG_0889 (Custom).JPG

Should I be looking for a framer or a structural engineer?

I don't think so. With 2 single doors, you would need a 3rd vertical support member, in the middle between both doors?

I need the clear span, since I plan on installing a machining center in the...

For direction of roof span (see pic)
My thinking, was to get rid of the wood beam & go with a steel beam
http://www.awedio.com/sdc/IMG_0416 (Large) (Custom)1.JPG

The height of my garage door is 7', I would like to increase the opening to approx. 100"
See pic.
The top of the garage door is at 84 inches
The header is 13 inches tall...