I recently put a new head on my a1 and was almost done
When my dumb *** dropped the exhaust cam and chipped one
Of the lobes. So I snatched up another cam from my spear parts
And installed it. I knew it was a Ls cam but totally spaced and didn't
realize it was a B1 cam... It runs fine but im worried.. Is there a
Difference between the two? And if there is will it hurt my motor?
Need help!

 

And what I'm worried about is loosing HP/torque.....

 

you'll be fine. they're not that much different.

 

I think the b1 cams are a little bigger. But like kyden said, the difference is so small you wont notice.