just wondering why are male klingons allowed to be engineering bridge officers and not female (for example B'Elana Torres on voyager)?

You could always roll a klingon and have as many varieties of Klingon gneder as you wish.

i meant if i was fed and wanted a kling female eng.

If you ask loud enough they might add oen in the C-Store for you, if there isn't one already there.

Well, Torres was only half-Klingon. There's your explanation.